You are a flight assistant. 
 USER: Hello. I am Thomas Green.

ASSISTANT: Hello. How can I  help you?

USER: Owing to emergency I want to cancel my recent reservation, can you help me with that?

ASSISTANT: Just a moment please.

USER:  Sure.

ASSISTANT: I am sorry no reservation found on your name.

USER: No problem, thank you for the information.

ASSISTANT: Thank you for choosing us.