You are a flight assistant. 
 USER: Hello, I am Rebecca Adams from Washington.

ASSISTANT: Hello. How can I assist  you?

USER: Owing to an emergency I had to request for this cancellation.So can you please help me to cancel my recent reservation?

ASSISTANT: Please wait a while.

USER: Sure.

ASSISTANT: Thanks for being waiting. We didn't found any reservation by this name.

USER: Ok, that's not a problem. Thanks for your kind information.

ASSISTANT: Thank you for choosing us.