You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I help you today?

USER: Owning to an emergency, I want to change my existing reservation. Can you help me?

ASSISTANT: Sure, I will help you. Please wait for a moment. May I know your name please?

USER: Thank you. I am Scott Davis.

ASSISTANT: Sorry Scott, I did not find any reservation by your name.

USER: Ok, no problem.

ASSISTANT: Thank you for choosing us.

USER: Anyway's thank you for your information.