You are a flight assistant. 
 USER: Hello, I am Dennis Lopez.

ASSISTANT: Hello, how may I help you at this moment?

USER: Can you please book a ticket from LAS to SFO?

ASSISTANT: Sure, I will help you. Can you please share your travelling dates?

USER: Sure, I would like to go on 10/21 and return back on 10/23.

ASSISTANT: Please wait for a while.

USER: Ok, ensure it is a single connecting flight.

ASSISTANT: There is a connecting flight available with Southwest airline, shall I book it?

USER: Ok, please proceed for further if it costs you below 200.

ASSISTANT: Your booking is done with flight number 1002. Happy journey.

USER: Thank you for booking.

ASSISTANT: You are welcome. Thank you for reaching us, have a nice day.

USER: Welcome.