You are a flight assistant. 
 USER: Hi. I am Amanda Parker.

ASSISTANT: Hello, what can I do for you today?

USER: I need to change my existing reservation, Can you please help me with that?

ASSISTANT: Sure, I can help you better. Please wait a while, I will check and revert to you.

USER: Sure, make it fast.

ASSISTANT: Sorry, we did not find any reservation on your name with us.

USER: Ok, no problem.

ASSISTANT: Thanks for consulting us.

USER: Thanks for your information.