You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you?

USER: My name is Brandon Harris. I would like to travel from AUS to SEA, could you help me out.

ASSISTANT: Sure.

USER: Could you help me in changing my travel dates in my existing reservation?

ASSISTANT: Sure, please give me a moment.

USER: Sure, take your time.

ASSISTANT: I am sorry, I did no find reservation for the given name.

USER: That's ok. Thank you, have a good day.

ASSISTANT: Thank you for reaching us.