You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I aid you today?

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

ASSISTANT: I will help you with that. Meanwhile may I know your name for better search?

USER: My name is Jacob Wilson.

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

USER: Sure.

ASSISTANT: Thanks for waiting but I am very sorry to say that there is no reservation found on your name to change.

USER: Not an issue. Thank you for your information.

ASSISTANT: Thank you for reaching us, have a nice day.