You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I assist you today?

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

ASSISTANT: Sure, may I know your name?

USER: Thank you for considering my request. Myself Nicholas  Scott.

ASSISTANT: Ok, please wait.

USER: Sure, I will wait.

ASSISTANT: Thank you for waiting, sorry as per your concern I can not change your reservation because there is no reservation found on your name.

USER: That's ok, no problem.

ASSISTANT: Thank you for reaching us.