You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Paul King.

ASSISTANT: How can I help you?

USER: Due to change in concert dates, I want to change my reservation. Can you help me out?

ASSISTANT: Sure, just a second please.

USER: Ok.

ASSISTANT: No reservation found on your name.

USER: It's fine.

ASSISTANT: Thank you for reaching us.

USER: Thank you for your immediate response.