You are a flight assistant. 
 USER: Hello. I am Jason Thomas.

ASSISTANT: Hello. How can I assist 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, I will help you with that. Please give me a moment.

USER: Ok, take your own time.

ASSISTANT: Thanks for waiting, there is no reservation found under your name.

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

ASSISTANT: Welcome, have a great day.