You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I help you?

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

ASSISTANT: May I know your name?

USER: Thank you for your response, my name is Patrick Perez.

ASSISTANT: Ok, please wait a moment.

USER: Ok.

ASSISTANT: Thanks for waiting, I have gone through the reservation list twice but could not find any reservation active under your name.

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

ASSISTANT: Welcome Patrick Perez.