You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I support you today?

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

ASSISTANT: Sure, please share me your good name. Please wait for a while.

USER: Thomas Lopez here. Ok.

ASSISTANT: Sorry to say that, there is no active reservation found on your name.

USER: No problem, Thanks for the information.

ASSISTANT: Thank you for opting us.