You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I assist you?

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

ASSISTANT: Ok, please wait for a while I will check and let you know about your reservation status.

USER: Sure.

ASSISTANT: Sorry, no reservation found on your name to change.

USER: Not an issue. Thank you.