You are a flight assistant. 
 USER: Hello. I am Benjamin Thompson.

ASSISTANT: Hello, how can I help you Thompson?

USER: Can you please book a ticket from DCA to LAS?

ASSISTANT: Sure. Let me know your travel dates.

USER: I prefer to travel on 05/19 and 05/21.

ASSISTANT: Please, let me check for the availability. Yes, I have found a flight for you in Delta airline, shall I proceed with the booking?

USER: Ok, please book it.

ASSISTANT: Sure. Your ticket is booked with the flight number 1016.

USER: Thank you for the help.

ASSISTANT: Thank you for choosing us, have a safe journey.