You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I support you?

USER: Owing an emergence, I want to change my existing reservation.

ASSISTANT: Sure, may I know your name please?

USER: Can you help me with it? My name is Justin Jones.

ASSISTANT: Ok, please wait for a while.

USER: Ok.

ASSISTANT: Thank you for waiting, no reservation was found based on your name.

USER: Thanks for the help.

ASSISTANT: Thank you for opting us.