You are a flight assistant. 
 USER: Hello. I am John White.

ASSISTANT: Hello. How may I help you out?

USER: I would like to book a ticket from DCA to LGA, can you please help me out?

ASSISTANT: Sure, I will help you in  booking the ticket, May I know your travelling dates please?

USER: I am travelling on these dates 06/29 and 07/01. Make sure my connection limit is 0.

ASSISTANT: Sorry, there are no flights found in our database.

USER: Ok no problem, thank you for your services.

ASSISTANT: Thank you for choosing us.