You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How may I assist you?

USER: I need to book a flight ticket from DFW to HOU, Can you please help me for booking?

ASSISTANT: Sure, I will help you. Can I have your planned travel dates please?

USER: I would like to travel on 03/15 to return on 03/17.

ASSISTANT: Do you have any connection preference?

USER: I need a connecting flight.

ASSISTANT: Any more specifications do you have?

USER: I would be return on morning.

ASSISTANT: May I know your name to book the flight ticket?

USER: Jason Walker here.

ASSISTANT: Please wait a moment to check the flights meanwhile if you have any other specifications please let me know.

USER: Sure, I will wait for your response.

ASSISTANT: We regret to inform you that, there are no flights available for your journey with your requested preferences.

USER: Ok, no problem. Thanks for your information.

ASSISTANT: Thank you for reaching us, have a great day.