You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may 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 am here to help you out. May I know your name please?

USER: I am Kimberly Thomas.

ASSISTANT: Kimberly Thomas, we haven't found any reservation under your name in our database.

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

ASSISTANT: Thank you for choosing us.