You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I assist you?

USER: 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. Can I have your name to check the reservation status?

USER: Myself Brandon Williams.

ASSISTANT: Please, wait for a while.

USER: Ok.

ASSISTANT: Thank you for waiting, there is no reservation found on your name to change.

USER: Not an issue. Thank you.

ASSISTANT: Thank you for availing us.