You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I aid you?

USER: I want to change an existing reservation, so please help me in changing the reservation.

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

USER: Myself Andrew Edwards.

ASSISTANT: Ok, please wait for a while.

USER: Ok.

ASSISTANT: Thanks for waiting, we did not find any active reservation on your name.

USER: Not an issue. Thank you.

ASSISTANT: Thank you for contacting us.