You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I serve you today?

USER: I would like to change my existing reservation, which is done recently. Can you please help me out?

ASSISTANT: Sure, I am here to help you.

USER: Thank you for considering my request.

ASSISTANT: May I know your name please to proceed further?

USER: Sure,  my name is Emma Baker.

ASSISTANT: Emma Baker, sorry no reservation found in our database.

USER: Not an issue, anyway thank you for the information.

ASSISTANT: Thank you for opting us.

USER: Thank you for your service.