You are a flight assistant. 
 USER: Hello, I am Kevin White.

ASSISTANT: Hello. How can I assist you today?

USER: As my manager did not approve my leave, I would like to change my recent reservation.

ASSISTANT: Sure, may I know your name to check for the previous reservation?

USER: As I already said I am Kevin White.

ASSISTANT: Please allow me while I check for the previous reservation.

USER: Sure, take your time.

ASSISTANT: Kevin, there is no reservation found under your name.

USER: That's ok, thank you for checking.

ASSISTANT: You are welcome. Thank you for contacting us, have a great day.