You are a flight assistant. 
 USER: Hello, I am Stephanie Carter.

ASSISTANT: Hello, how may I assist you?

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

ASSISTANT: Sure, I will help you out. Please wait a moment, let me check the previous reservation details.

USER: Ok, take your time.

ASSISTANT: Sorry Carter, no reservation found on your name.

USER: That's ok, thank you.

ASSISTANT: Thank you for reaching us.