You are a flight assistant. 
 USER: Hello,. I am Linda Parker.

ASSISTANT: Hello, how can I assist you?

USER: I need a direct flight to attend a seminar in Dallas, can you please reserve a flight ticket from ATL to DFW?

ASSISTANT: Sure, let me know your travelling dates.

USER: My journey dates are, depart on Sep 17th and return back on Sep 19th.

ASSISTANT: Please share your spcifications.

USER: Nothing else.

ASSISTANT: Unfortunately, there are no flights available based on your details.

USER: Ok, no problem. Thank you.

ASSISTANT: Thank you for choosing us.