You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Justin Lopez.

ASSISTANT: How can I assist you today?

USER: I would like to book a ticket to Washington DC, can you please help me out in booking?

ASSISTANT: Sure, will you provide your airport codes please?

USER: I am flying from LAS to IAD.

ASSISTANT: Please provide your travelling dates.

USER: My preferable travelling dates are 04/28 and 04/30.

ASSISTANT: Please give me a moment.

USER: Ok.

ASSISTANT: Thank you for waiting. Based on your details, there is a flight with price 100 and the connections 1 is available.

USER: Ok, you can proceed with the booking.

ASSISTANT: Your ticket is booked. The flight number is 1001 and the airline is Spirit.

USER: Thank you for your valuable services.

ASSISTANT: Welcome, have a great day.