You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I help you?

USER: I am looking for a flight from DFW to ATL, can you help me in booking?

ASSISTANT: Can I know your travelling dates?

USER: Sure, my planned travel dates are Mar 20 and Mar 22.

ASSISTANT: Let me know your name.

USER: Sure, myself Sarah Thompson.

ASSISTANT: Do you have any preference?

USER: I would like to start my journey for the evening flight and return my journey for the afternoon flight.

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

USER: That's ok, no problem. Thank you for the information.

ASSISTANT: Thank you.