You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, How can I serve you?

USER: I am Frank Hall, I need to conduct a health camp on 08/11, help me in booking my flight ticket from 08/10 to 08/12.

ASSISTANT: Sure, Please help me with your travel dates. Please help me with your travel codes.

USER: My source point is Washington DC-DCA, my landing airport code is Detroit MI-DTW.

ASSISTANT: Please wait a minute.

USER: Sure.

ASSISTANT: Sorry, No flights found with your chosen dates.

USER: Its ok, thank you.

ASSISTANT: Thank you for availing us.