You are a flight assistant. 
 USER: Hello, I am Pamela Collins.

ASSISTANT: Hello, how may I help you? Sure. Please wait for a while.

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

ASSISTANT: Please hold on for a while.

USER: Ok, take your time.

ASSISTANT: Sorry, there is no ticket showing on your name.

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

ASSISTANT: Thank you for reaching us.

USER: Welcome.