You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I assist you?

USER: I am Matthew Williams. I am planning to book a ticket to attend a meeting at DCA. Can you please help me out to book a ticket from LAS?

ASSISTANT: Sure Williams, can I know the travel dates please?

USER: I would like to travel on 05/27 and return back on05/29.

ASSISTANT: Ok, wait a moment please. There is a flight in UA airline with price 100, can I book it?

USER: Yes, you can book it.

ASSISTANT: Your ticket has been booked with flight number 1005.

USER: Thank you for contacting us.

ASSISTANT: Thank you for approaching us.