You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: David Perez here.

ASSISTANT: How can I assist you today?

USER: I would like to visit Washington for a business trip, so can you please help me out with booking of a flight ticket to go there?

ASSISTANT: Sure, I will help you on that.

USER: Thank you.

ASSISTANT: Can you please help me by providing your travelling dates?

USER: My boarding is on 01/19 and please book a return ticket on 01/21.

ASSISTANT: Will you provide your airport codes please?

USER: Sure, I want to travel from LAS to DCA.

ASSISTANT: Please give me a moment.

USER: Sure.

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

USER: That's great, it saves my cost also, you can proceed with booking.

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

USER: Thank you for your assistance.

ASSISTANT: Welcome, have a great day.