You are a flight assistant. 
 USER: Hello. I am Daniel Campbell.

ASSISTANT: Hello, how may I aid you?

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

ASSISTANT: Sure. Please, wait.

USER: Ok, take your own time.

ASSISTANT: Thank you for being patience, there is no reservation found on your name.

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

ASSISTANT: Thank you for reaching us.