You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Debra Brown.

ASSISTANT: How shall I help you?

USER: I need to book a flight from DC-IAD to CO-DEN.

ASSISTANT: Can you forward your dates of journey?

USER: Sure, I would like to travel from 12/23 to 12/25.I need direct flight with price of 1000.

ASSISTANT: Ok, your flight number is 1004 with Frontier airline. But there is one connection.

USER: Ok, But I need direct flight.

ASSISTANT: Ok, but there are no flights with direct connection.

USER: Ok, thanks for your information.

ASSISTANT: Thank you.