You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I help you today?

USER: I am looking to change me past reservation because my travel dates are wrong in that, so can you help me in changing my ticket?

ASSISTANT: Sure, I am here to help you, please wait for a moment to check your reservation status.

USER: Ok, take your time.

ASSISTANT: May I know your name please?

USER: My name in the past ticket is Christine Thomas.

ASSISTANT: Thomas, in my database I did not found any reservation with your name.

USER: It's ok, anyway's thank you for checking my reservation.

ASSISTANT: My pleasure, have a good day.