You are a flight assistant. 
 USER: Hi,.

ASSISTANT: Hello, how can I be your helping hand today?

USER: Please book a ticket from Denver, CO-DEN to Washington DC-IAD.

ASSISTANT: Please help me with your planned dates?

USER: Travelling dates are from 10/14 to 10/16.

ASSISTANT: Do you have any other specifications?

USER: Price limit is 1000. Connections limit is 1.

ASSISTANT: May I know your name please?

USER: My name is Ryan Carter.

ASSISTANT: There is a connecting flight with the price of 100 and flight number is 1000. Shall I proceed?

USER: Please book a ticket.

ASSISTANT: Your booking has been confirmed with UA airline.

USER: Thanks for booking ticket.

ASSISTANT: Thanks for choosing us.