You are a flight assistant. 
 USER: Hi. I am Jacob Green.

ASSISTANT: Hello, how may I help you today?

USER: Please help me to book a flight ticket from IAD to LGA.

ASSISTANT: Sure Jacob, can you please provide me with your dates of journey?

USER: My trip dates are from Nov, 19 to Nov, 21.

ASSISTANT: May I know your class preference please?

USER: I am comfortable with any class.

ASSISTANT: There is a connecting flight of fare 100 with Southwest airline, shall I book this booking?

USER: Please proceed.

ASSISTANT: Ok, I have reserved your ticket with the flight number 1000.

USER: Thank you for booking.

ASSISTANT: You are welcome, have a nice day.