You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. What service you are looking for?

USER: I need your help to change an existing reservation.

ASSISTANT: Sure, can I know your name please?

USER: My name is James Gonzalez.

ASSISTANT: OK, please wait a moment.

USER: Sure.

ASSISTANT: Sorry there is no reservation found under your name.

USER: That's OK.

ASSISTANT: Thank you for contacting us, have a good day.

USER: Thank you for the information.