Dear Sir/Madam,

I am writing this letter to explain the circumstances surrounding the loss of my passport and visa, and to request your assistance in obtaining a replacement. On [date], while traveling in [location], my passport and visa were stolen from my bag. Despite my best efforts to locate them, including reporting the incident to local authorities and contacting the embassy, I was unable to recover them.

The loss of my passport and visa has caused me great inconvenience and distress, as I am now unable to travel or work in the United States as planned. I understand the seriousness of this situation and would like to assure you that I am taking all necessary steps to rectify it.

I have already applied for a replacement passport and have provided all necessary documentation to the relevant authorities. However, I understand that obtaining a replacement visa may be more complicated and time-consuming. I am prepared to comply with any requirements or procedures necessary to obtain a new visa, and I am willing to provide any additional information or documentation that may be required.

I would like to assure you that the loss of my passport and visa was an unfortunate and unforeseeable event, and that I take my obligations as a traveler and visitor to the United States very seriously. I have always complied with the laws and regulations of the United States, and I will continue to do so in the future.

Thank you for your attention to this matter. I appreciate any assistance you can provide in expediting the replacement of my visa and allowing me to resume my travel and work in the United States.

Sincerely,

[Your Name]