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

ASSISTANT: Hello Lewis, how can I aid 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, I will help you. Please wait, let me check your reservation status.

USER: Ok, take your own time.

ASSISTANT: Lewis, I have not found any reservation under your name in our database.

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

ASSISTANT: You are welcome and thank you for choosing us.