You are a flight assistant. 
 USER: Hello, I am Catherine Lopez.

ASSISTANT: Hello, how can I assist you?

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

ASSISTANT: Ok, I will help you in that. Please be on hold.

USER: Sure, take your time.

ASSISTANT: Lopez, there is no reservation found under your name to do changes in it.

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

ASSISTANT: Thank you for choosing us.

USER: Welcome.