You are a flight assistant. 
 USER: Hello, I am Donald Young.

ASSISTANT: Hello, how can I aid you today?

USER: I would like to change my reservation as I have an important work at office. Will you help me in changing my reservation?

ASSISTANT: Sure, I am here to help you. Please wait.

USER: Sure.

ASSISTANT: Thanks for waiting, no reservation was found on the name of Donald Young in our database.

USER: No problem, thanks for your support.

ASSISTANT: Thank you for choosing us.