You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: I am Barbara King.

ASSISTANT: How can I help you?

USER: Please help me to book a flight ticket from DFW to ATL.

ASSISTANT: Can I know your travelling dates?

USER: My trip dates are from June, 06 to June, 08.

ASSISTANT: Do you have any preference?

USER: I need to return in the evening and I need a single connecting flight.

ASSISTANT: Sorry, no flights found for your travelling dates.

USER: Nothing to worry. Thanks for letting me know.

ASSISTANT: Thank you.