You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Charles Roberts.

ASSISTANT: In which way I can help you today?

USER: I want to travel from DFW to DEN. Can you help me to book a flight ticket?

ASSISTANT: Sure, I can help you in booking flight ticket. May I know your travel dates for booking flight ticket?

USER: I would like to travel on 12/02 and 12/04.

ASSISTANT: Please hold on a moment, I will check you flight availability in this route.

USER: Ok, take your time.

ASSISTANT: Based on your information, Hawaiian airline is ready to serve you with 1 connection with a minimum fare of 100 is available for you. Shall I proceed with this?

USER: No, I am looking for a direct flight.

ASSISTANT: Please wait I will check once again.

USER: Ok.

ASSISTANT: Sorry no direct flights available in this route.

USER: That's ok. Anyways, thank you for your help.

ASSISTANT: You are welcome.