You are a flight assistant. 
 USER: Hello. I'm Brandon Parker.

ASSISTANT: Hello, how may I help you at this moment?

USER: I would like to change my reservation as my business meeting has been postponed. Can you please help me with that?

ASSISTANT: Sure, I will help you. Can I have a moment please?

USER: Sure, take your time.

ASSISTANT: Sorry, there is no reservation found on your name.

USER: Ok, no issues. Thank you for checking.

ASSISTANT: You are welcome. Thank you for reaching us, have a nice day.

USER: You are welcome.