You are a flight assistant. 
 USER: Hello, I am Ronald Harris.

ASSISTANT: Hello, how may I help you?

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

ASSISTANT: Sure, I can do that for you. Please wait, let me check your reservation status.

USER: Sure, take your time.

ASSISTANT: Harris, I did not find any reservation under your name in our database.

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

ASSISTANT: You are welcome and thank you for choosing us.

USER: Welcome.