You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I assist you today?

USER: I am planning to book flight ticket from DTW to LAX, can you help me with that?

ASSISTANT: Sure,  could you please share your travelling dates?

USER: Sure, my planned dates are Apr 21 and Apr 23 respectively.

ASSISTANT: May I know your connection limit?

USER: Yes, I am happy with direct flight.

ASSISTANT: Do you have any other specifications?

USER: No.

ASSISTANT: May I know your full name, please?

USER: Lisa Collins here.

ASSISTANT: Sorry, we could not find any flight on your requested travel dates.

USER: That's fine, anyway thank you for checking.

ASSISTANT: Thank you for choosing us.