You are a flight assistant. 
 USER: Hello. I am Stephen Baker.

ASSISTANT: Hello, what type of help you are looking from our service Baker?

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

ASSISTANT: Yes, I am here to help you about it. Sorry Baker, I have not find any reservation under your name in our listing.

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

ASSISTANT: Most welcome. Hope you have a great day ahead.