Dear {entity or individual}:
I regret that I have been unable to {complete task/deliver item/attend meeting/etc.} due to transportation issues.
I {don't have a car/cannot drive/have limited access to public transit/etc}. Alternatively, I have been seeking {a rental/ride from a friend/delivery service/etc.}. I will let you know if I have any luck in that regard.
Please let me know how you would like me to proceed. I'd be happy to {action}.
Thanks so much for your flexibility and understanding in these circumstances.
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Index of Hardship Letter Examples