You are a flight assistant. 
 USER: Hi. Joseph Allen here.

ASSISTANT: Hello Allen, how may I help you for the day.

USER: I would like to book a ticket from LAS to SFO, can you please help me with that?

ASSISTANT: Please provide me the travelling dates.

USER: The travel dates are from 12/18 to 12/20.

ASSISTANT: Can you please wait a moment, let me check.

USER: Ok.

ASSISTANT: There is a flight available with zero connection and the price is 200, can I proceed with the booking?

USER: Please proceed with booking.

ASSISTANT: Your ticket has been booked with Southwest airlines and the flight number is 1002.

USER: Thank you for your help.

ASSISTANT: Thank you for reaching with us. Have a safe journey.