You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: Myself Elizabeth Parker.

ASSISTANT: How may I help you?

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

ASSISTANT: Sure, please wait a moment I will revert you back with the proper information.

USER: Sure, take your time.

ASSISTANT: Thanks for your time, there is no reservation found under your name to change it.

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

ASSISTANT: Thanks for choosing us, have a good day.

USER: Welcome.