You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am John Young.

ASSISTANT: How can I assist you today?

USER: I have to attend my sister's wedding at Las Vegas, could you please help me with booking a flight ticket from DCA to LAS?

ASSISTANT: Sure, can you please share your travel dates?

USER: I would like to take off on 08/21 and return on 08/23.

ASSISTANT: Let me check for the availability of flight.

USER: Sure.

ASSISTANT: John, there is a flight available with price 100 and the connection is 1 with UA airline. Would you like me to proceed with the booking?

USER: Please confirm the booking.

ASSISTANT: Your booking is confirmed with 1013 flight number.

USER: I really appreciate your help, thank you for your service.

ASSISTANT: Thank you for reaching us.