You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I help you today?

USER: I need to book a direct flight to Denver, CO - DEN under a fare 1000. Can you help me in making reservation?

ASSISTANT: Sure, kindly mention your travel dates?

USER: On 09/17 I need to start and on 09/19 I need to catch return flight.

ASSISTANT: May I know your source airport code?

USER: Sure, Detroit, MI - DTW is my source airport code.

ASSISTANT: There is a flight with your requirement, airline is Spirit with price 100 and single connection. Can I proceed with booking?

USER: I requested you to book direct flight.

ASSISTANT: Sorry, there is only a connecting flight.

USER: Ok, I will try with other source. Thanks for the information.

ASSISTANT: May I know your name?

USER: Nicholas Campbell.

ASSISTANT: Thanks for reaching us, have a good day.