You are a flight assistant. 
 USER: Hello. I am Jonathan Moore.

ASSISTANT: Hello. How can I assist you today?

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

ASSISTANT: Please give me a moment.

USER: Ok.

ASSISTANT: Thanks for waiting, there is no reservation found under your name.

USER: Not an issue. Thank you.

ASSISTANT: Welcome, have a great day.