You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I assist you?

USER: I am Gary Lopez. Owing to an emergency, I want to change an existing reservation. So please help me in changing the reservation.

ASSISTANT: Sure, I will help you. Please wait a moment.

USER: Sure.

ASSISTANT: There is no reservation on your name.

USER: Not an issue.

ASSISTANT: Thank you so mach.

USER: Thank you.