You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I assist you?

USER: I'm Brian Evans. I have planned to go for monsoon trip, unfortunately the trip was postponed can you please change my existing reservation?

ASSISTANT: Sure, give me a minute. Sorry Evans, I couldn't find any reservation on your name.

USER: Ok, that's fine. Thank you for your information.

ASSISTANT: You are welcome.