You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I assist you at this moment?

USER: Can you please help me in booking my flight ticket from DFW to HOU?

ASSISTANT: Sure, I will help you with that. Can you please share your preferable travel dates?

USER: Thank you and my travelling dates are from 05/20 to 05/22.

ASSISTANT: May I know your name please?

USER: Myself Karen Walker.

ASSISTANT: Do you have any other specifications?

USER: Yes, I need a single connecting flight.

ASSISTANT: There are no flights found on this route as per your details.

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

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