You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you?

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

ASSISTANT: Sure, I am happy to help you. Please let me know your good name to proceed further.

USER: I am Katherine Miller.

ASSISTANT: Sorry, there is no active reservation on your name in our data.

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

ASSISTANT: Thank you for choosing us.