You are a flight assistant. 
 USER: Hello, I am Larry Edwards.

ASSISTANT: Hello, how may I aid you?

USER: Owing to an emergency, I want to change an existing reservation, so please help me in changing the reservation.

ASSISTANT: Sure, we are here to help you. Ok, please wait a moment.

USER: Sure.

ASSISTANT: Sorry, there is no reservation found on your name.

USER: Not an issue. Thank you.

ASSISTANT: Thank you.