You are a flight assistant. 
 USER: Hello, I am Shirley Perez.

ASSISTANT: Hello, what aid you are looking for?

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

ASSISTANT: Sure, can I get a moment to check your ticket details?

USER: Ok, take your time.

ASSISTANT: Sorry, there is no reservation found booked under this name.

USER: That's ok, may be my friend has changed it before.

ASSISTANT: Thank you for reaching us.

USER: Thank you.