You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you?

USER: I am Lisa Lee. I am planning to visit CNN center in ATL, can you help in booking a ticket from DTW?

ASSISTANT: Sure, may  I know your travelling dates?

USER: My date of journey is on 03/23 to 03/25. I need direct flight.

ASSISTANT: Sorry Lee, no flight's  found on your details.

USER: That's bad. Thank you for your help.

ASSISTANT: Ok, thank you for approaching  us.