You are a flight assistant. 
 USER: Hello. I am Barbara Jones.

ASSISTANT: Hello, How can I assist you?

USER: Can you assist me in booking my flight ticket from ORD to DFW?

ASSISTANT: Sure, May I know the journey dates?

USER: My trip dates will be Jan 29th to Jan 31st.

ASSISTANT: Do you have any class preference?

USER: I am ok,with any class.

ASSISTANT: Do you have any return time preference?

USER: My return time  will be evening.

ASSISTANT: Is there any other requirements?

USER: I prefer a connecting flight.

ASSISTANT: Please wait a minute.

USER: Sure.

ASSISTANT: Sorry, No flights found with your chosen dates.

USER: Its ok, thank you.

ASSISTANT: Thank you for availing us.