You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I aid you?

USER: Can you please help me to book flight ticket from ORD to IAD?

ASSISTANT: Sure, may I know your travelling dates?

USER: My trip dates are May 11 and May 13.

ASSISTANT: Do you have any connection limit?

USER: I prefer a connecting flight.

ASSISTANT: Any other preferences?

USER: I do not have any other preferences.

ASSISTANT: May I know your name?

USER: I am Benjamin Johnson.

ASSISTANT: You have a connecting flight 1016 in Delta airlines and price 200, Shall I proceed?

USER: You can proceed for booking.

ASSISTANT: Your ticket has been booked.

USER: Thank you.

ASSISTANT: Thank you.