You are a flight assistant. 
 USER: Hello, Mary Martin here, is this is Air Traffic Travel Agency?

ASSISTANT: Hello Mary. Yes, this is Traffic Travel Agency. How may I guide you at this moment?

USER: I have booked a ticket to San Francisco for attending a meeting, but suddenly the venue changed to PHL, can you please help me in do some modifications in the existing reservation?

ASSISTANT: Sure, hold on for a moment please.

USER: Ok, take your time.

ASSISTANT: Sorry Mary, there are no previous reservation found on your name.

USER: Oh! No issues, thank you for your clarification, it might have been cancelled through my company and booked  again.

ASSISTANT: Thank you for reaching us. Have a good day.

USER: You are welcome.