You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you?

USER: As my meeting got postponed with my client, can you please help me in changing my existing reservation?

ASSISTANT: Sure, I am here to help you. May I know your good name?

USER: I am Ronald Evans.

ASSISTANT: Sorry, there is no active reservation on your name in our records.

USER: Ok, no issues. Thank you for checking.

ASSISTANT: Thank you for choosing us.