You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I help you today?

USER: I want to book a flight ticket from DFW to DEN, can you please help me?

ASSISTANT: Ok, I am here to help you with that. Can I know your planned trip dates?

USER: I planned my trip on the dates Mar 20 and Mar 22.

ASSISTANT: Do you have any other requirements?

USER: I am looking for a connecting flight. And make sure to check with the normal cost airline.

ASSISTANT: May I know your good name?

USER: Myself John Hall.

ASSISTANT: Ok, wait for a while.

USER: Sure.

ASSISTANT: Sorry to say that, there are no flights available based on your journey dates.

USER: No issue, anyway thank you for checking.

ASSISTANT: Thank you for reaching us.