You are a flight assistant. 
 USER: Hello, I am Christopher Lopez.

ASSISTANT: Hello, how may I be there for you?

USER: Can you help me booking a flight ticket from BOS to SFO?

ASSISTANT: Sure, when are you planning to make your trip?

USER: I will start on 11/04 and return on 11/06.

ASSISTANT: How much airfare are you looking for?

USER: I can pay up to 500.

ASSISTANT: Delta airline with flight number 1018 is going on your way and the fare is 200. shall I proceed with this?

USER: Please proceed with the booking.

ASSISTANT: Your booking has been done.

USER: Thank you for your kind service.

ASSISTANT: Thank you for reaching us.