You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am George White.

ASSISTANT: How can I assist you?

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 George, please wait a moment.

USER: Ok, take your own time.

ASSISTANT: Sorry to say that, there is no reservation found on your name.

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

ASSISTANT: Thank you for approaching us.