You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I aid you today?

USER: My name is William Moore and I would like to change my reservation.

ASSISTANT: Sure, we are here to help you. Ok, wait for some time I will check the reservations on your name and get back to you.

USER: Sure. Take your time.

ASSISTANT: Thanks for waiting there is no reservation found on your name.

USER: No Issue, thank you for the time.

ASSISTANT: Thanks for approaching us.