You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I assist you?

USER: I would like to cancel my recent reservation because my trip dates are got postponed, can you help me?

ASSISTANT: Sure, I can help you with that. May I know your good name please?

USER: I am Rebecca Thompson.

ASSISTANT: Ok, please wait for a while.

USER: Sure.

ASSISTANT: Rebecca Thompson, there is no active reservation found under your name to do cancellation.

USER: That's ok, thank you for checking.

ASSISTANT: Thank you for choosing us.