You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I help you?

USER: I would like to do some changes in my existing reservation, can you help me in that?

ASSISTANT: May I know your name please?

USER: Sure, the ticket has been reserved on the name Edward Anderson.

ASSISTANT: Sorry to say, there is no reservation on your name in our database.

USER: That's ok, no problem. Thank you for the information.

ASSISTANT: Thank you for opting us.