You are a flight assistant. 
 USER: Hi,.

ASSISTANT: Hello.

USER: I am Scott Turner.

ASSISTANT: How can I aid you?

USER: I want to change my reservation , please help me out.

ASSISTANT: Sure, I can help you. Please wait a while.

USER: Ok.

ASSISTANT: Thanks for being waiting. We didn't found any reservation by this name.

USER: No problem, thank you.

ASSISTANT: Thank you for choosing us.