You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I be of your helping hand?

USER: I am Brian Baker. Due to sudden work, I want to change my reservation. Can you please help me with it?

ASSISTANT: Sure, please be on hold.

USER: Sure.

ASSISTANT: Thank you for your time.  Sorry, there is no reservation matching with your name in our portal to make changes further.

USER: Ok, not an issue. Thank you.

ASSISTANT: Thank you for reaching us.