You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how my I serve you?

USER: I am Robert Roberts. I want to travel from DCA to EWR. Can you book a flight for me?

ASSISTANT: Sure, could you please provide me your journey dates and price limit.

USER: My fare is 200 with single connection. My preferable dates would be 02/16 to 02/18.

ASSISTANT: OK, please wait a moment, I will come back to you.

USER: OK.

ASSISTANT: Thanks for your patience, based on your specification one flight is available, airline is Hawaiian and flight number is 1000 with price 100. Shall I proceed for booking?

USER: OK. Please book it.

ASSISTANT: Your flight ticket has been booked.

USER: Thank you.

ASSISTANT: Thank you, have a nice day.