You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I assist you?

USER: I am Lisa Nelson. Can you help me in booking a ticket from DCA TO DTW?

ASSISTANT: Sure, could you please mention your dates of travel?

USER: My planning dates are from 01/16 to 01/18.

ASSISTANT: Sorry to say, no flights were found on your requested dates.

USER: That's fine. Anyway, thank you for your help.

ASSISTANT: Thank you for choosing us, have a pleasant day.

USER: You are welcome.