You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I assist you?

USER: Due to some problems my trip was cancelled so can you please cancel my flight ticket?

ASSISTANT: Sure. Tell me your name please?

USER: Thank you for your response, my name is Christine Davis.

ASSISTANT: Please wait.

USER: Ok.

ASSISTANT: I have searched online but I could not find your flight reservation to cancel it.

USER: Oh! It's ok, no problem. Thank you for your information.

ASSISTANT: Thank you.