You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I assist you?

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

ASSISTANT: Sure, I am happy to help you. Can you please let me know your good name?

USER: Thank you for considering my request. Myself Andrew Adams.

ASSISTANT: Sorry, there is no active reservation on your name in our records.

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

ASSISTANT: Thank you for choosing us.