You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I assist you today?

USER: I would like to change my recent reservation, will you help me with that?

ASSISTANT: Sure, may I know your name for the changing process?

USER: Thank you for accepting my request, myself David Clark.

ASSISTANT: Thank you, please wait for a moment.

USER: Sure, I will wait.

ASSISTANT: Sorry, we couldn't find a reservation on your name to change.

USER: Ok, not an issue. Thank you for your information.

ASSISTANT: Welcome, thank you for reaching us.