You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How May I assist You ?

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

ASSISTANT: May I know your name please.

USER: My name is Richard Taylor.

ASSISTANT: No reservation found as per your preferences Richard Taylor.

USER: Ok, no problem. Thank you for the information.

ASSISTANT: Thank you for contacting us.