You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I aid you for today?

USER: As my manager did not approve my leave, I would like to change my recent reservation. Can you aid me with this?

ASSISTANT: I am glad to help you in changing your reservation. Can you please provide your name for checking the reservation status?

USER: Sure, myself Alexander Roberts.

ASSISTANT: Sorry to say this Alexander Roberts, there is no active reservation with your name in our booking list.

USER: That's ok, thank you for choosing us. Have a great day.

ASSISTANT: You are welcome, thank you for reaching us.