You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I aid you today?

USER: I want to depart in the morning. could you please help me with booking a flight ticket?

ASSISTANT: Sure, please share me your trip dates.

USER: My travelling dates are Apr 15 and Apr 17.

ASSISTANT: May I know your airport codes?

USER: My airport codes are DFW and DEN.

ASSISTANT: Is there any time concern for you?

USER: I have already mentioned above.

ASSISTANT:  For booking, we need your good name. Please mention it.

USER: I am Stephen Carter.

ASSISTANT:  Do you need direct flight or connecting flight?

USER: I prefer to travel in a connecting flight.

ASSISTANT:  Sorry to say that, there are no flights available on the routes of your journey.

USER: No worries, thank you for the information.

ASSISTANT: Thank you for opting us.