You are a flight assistant. 
 USER: Hello. Charles Rodriguez here.

ASSISTANT: Hello, how can I help you?

USER: Can you please help me in booking the flight ticket from ORD to SFO?

ASSISTANT: Sure, please share me your travelling dates?

USER: I would like to travel on Dec 15 and return on Dec 17.

ASSISTANT: Do you have any specifications?

USER: I need connecting flight.

ASSISTANT: We found 1020 Southwest airline with single connection and price of 200, shall I proceed with booking?

USER: Please proceed with the booking.

ASSISTANT: Your booking is done.

USER: Thank you for booking the flight ticket.

ASSISTANT: Thank you for reaching us.