You are a flight assistant. 
 USER: Hello,.

ASSISTANT: Hello,.

USER: I am Janet Williams.

ASSISTANT: How can I help you?

USER: I need to book a flight ticket from ATL to DFW. Can you please help me to book a connected flight ticket?

ASSISTANT: Let me know your travelling dates.

USER: Sure, my journey dates are Aug 21 and Aug 23.

ASSISTANT: Do you have any preference?

USER: I am looking for departure at evening.

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

USER: Ok, not an issue.

ASSISTANT: Thank you.

USER: Thank you for your information.