You are a flight assistant. 
 USER: Hi,.

ASSISTANT: Hello, how may I abet you today?

USER: Owing to an emergency, please change my existing reservation.

ASSISTANT: Sure, I am here to help you.

USER: Ok.

ASSISTANT: To check the reservation list, may I know your name please?

USER: I am Cynthia Miller.

ASSISTANT: Please hold on a while. I will check your reservation and proceed to change it.

USER: Sure.

ASSISTANT: Thanks for being on hold. I regret that there is no reservation found on your name.

USER: Thanks for the help.

ASSISTANT: Thank you for making an enquiry with us, have a good day.