You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: William Lopez here.

ASSISTANT: How can I assist you?

USER: I would like to visit Golden Gate which is at San Francisco in this winter vacation.Please help me in booking a flight ticket.

ASSISTANT: Yes, can I know your travelling airport codes?

USER: Sure, I am flying to SFO from MCO.

ASSISTANT: Ok, could you help me with your travelling dates?

USER: Sure, I will go on 12/21 and return on 12/23.

ASSISTANT: I have found a flight for you with a price of 100 and a connection of 2. Can I book the ticket?

USER: Actually I need a flight with 1 connection.So, don't proceed with the booking.

ASSISTANT: Yes, I got a flight with 1 connection, but the price is 200.

USER: Ok, then you can proceed.

ASSISTANT: Ok, your ticket is booked.

USER: Thank you for your service.

ASSISTANT: You are welcome.