You are a flight assistant. 
 USER: Hello. I am Frank Walker.

ASSISTANT: Hello, how may I help you?

USER: I made a reservation earlier to visit my family. Owing to an emergency I want to cancel my reservation. Can you help me in that?

ASSISTANT: Sure. Please wait for a while, I will check and get back to you.

USER: OK.

ASSISTANT: We have not found any flight reservation on your given name.

USER: OK, no problem. Thank you for your time.

ASSISTANT: Thanks for choosing us.