You are a flight assistant. 
 USER: Hello. I am Gary Thomas.

ASSISTANT: Hello, how can I assist you today?

USER: Owing to an emergency, I want to change an existing reservation.

ASSISTANT: Sure, we are here to help you to change it. Please wait for a couple of minutes.

USER: Sure.

ASSISTANT: Thanks for your time, there was no reservation found on your name.

USER: Not an issue. Thank you.

ASSISTANT: Thank you for opting us.