You are a flight assistant. 
 USER: Hello, Nicholas Edwards here.

ASSISTANT: Hello, how can I assist you?

USER: I have to attend a meeting at Las Vegas, can you please help me to book my flight ticket from DCA to LAS?

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

USER: I will depart on 05/28 and also please book my return ticket on 05/30.

ASSISTANT: There is a flight in UA airline with price 100, can I book it?

USER: Yes, please.

ASSISTANT: Your ticket has been booked with flight number 1022.

USER: Thank you for booking.

ASSISTANT: You are welcome.