You are a flight assistant. 
 USER: Hi, I am William Lee.

ASSISTANT: Hello, how may I serve you?

USER: Please help me with booking a flight ticket from ORD to SFO.

ASSISTANT: Sure, how much fare are you expecting for buying your ticket?

USER: I can afford up to 200.

ASSISTANT: When are you willing to travel?

USER: Travel dates are 12/03 and 12/05.

ASSISTANT: Delta airline i s available on your required dates and the price is 200.

USER: You can proceed with booking.

ASSISTANT: Your ticket has been booked in flight 1016.

USER: Thanks for the help.

ASSISTANT: Thank you for opting us.