You are a flight assistant. 
 USER: Hello. I am Christine Lewis.

ASSISTANT: Hello, what can I do for you today?

USER: I had planned to go on a trip, but it was postponed due to some reasons. Can you change my recent reservation?

ASSISTANT: Sure, we are ecstatic to help you.

USER: Ok.

ASSISTANT: Please wait for a while.

USER: Ok, take your time.

ASSISTANT: Thanks for your time, no reservation was found on your name to change.

USER: That's ok. Anyways, thank you for your help.

ASSISTANT: Thank you for choosing us.