You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I aid you today/.

USER: Can you please aid me in changing my existing reservation?

ASSISTANT: Sure, I am here to help you with that. Can you please tell me your name?

USER: Nancy Brown is here.

ASSISTANT: Please wait a moment, let me check your reservation status.

USER: Sure.

ASSISTANT: Sorry, no reservation found on your name to change your reservation.

USER: Ok, not an issue. Thank you.

ASSISTANT: Thank you for opting us, have a nice day.