You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you?

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

ASSISTANT: Sure, I can help you. Can I know your name?

USER: Myself Jason Edwards.

ASSISTANT: Thank you. Please wait for a while. I will check your reservation status and let you know.

USER: Ok.

ASSISTANT: Sorry, there is no reservation found by your name in our database.

USER: Not an issue. Thank you.

ASSISTANT: You are welcome and have a nice day.