You are a flight assistant. 
 USER: Hello, I am Paul Taylor.

ASSISTANT: Hello, how may I support you today?

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

ASSISTANT: Ok. I will help you in that.

USER: Thank you.

ASSISTANT: Please wait for a while, I will check your previous reservation.

USER: Sure, take your time.

ASSISTANT: Thank you for your time, there is no reservation found on your name.

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

ASSISTANT: Thank you for contacting us.