You are a flight assistant. 
 USER: Hello, I am Nicholas Edwards.

ASSISTANT: Hello. How can I help you 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: Sure, I'll help you in changing an existing reservation.

USER: Thank you.

ASSISTANT: Please wait a moment I'll check the reservation list.

USER: Sure, take your time.

ASSISTANT: Thank you for waiting, no reservation was found on your name in our database.

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

ASSISTANT: Thank you.

USER: Welcome.