You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you?

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 am willing to help you for this. Could you please share me your name?

USER: Myself Charles Lee.

ASSISTANT: Please wait for a while, let me check the reservation status.

USER: Sure, take your time.

ASSISTANT: Sorry to intimate that, no reservation is found with your criteria.

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

ASSISTANT: You are most welcome.