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

ASSISTANT: Hello, how may I serve you?

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

ASSISTANT: Surely, I will help you. Can you send your journey dates?

USER: Sure, take your time.

ASSISTANT: Ok. Sorry, there is no reservation found on your name.

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

ASSISTANT: You are welcome. Thank you for reaching us, have a nice day.

USER: Welcome.