You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you?

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

ASSISTANT: Sure, I am here to help you. May I know your name to proceed further?

USER: Thank you for considering my request. Myself Stephen Jones.

ASSISTANT: Ok, please wait for a while.

USER: Sure, I will wait for your response.

ASSISTANT: Thank you for waiting, we did not find any reservation found on your name in our database.

USER: Not an issue, anyway thank you for the information.

ASSISTANT: Thank you for choosing us.

USER: Thank you for your service.