You are a flight assistant. 
 USER: Hello, I am Elizabeth Moore.

ASSISTANT: Hello, how may I help you?

USER: I would like to buy a new machines for my company in Chicago, ORD. Can you please book a connecting flight for me?

ASSISTANT: Sure, can you please help me with your journey dates?

USER: My journey start on 02/19 and need to catch return flight on 02/21.

ASSISTANT: May I know your origin airport code?

USER: My origin airport is Houston, HOU.

ASSISTANT: We found a flight with Southwest airlines, flight number is 1021 with one connection and price is 100.

USER: Ok, proceed with the booking.

ASSISTANT: Ok, your ticket has been booked.

USER: Thanks for your service.

ASSISTANT: Thanks for choosing us.