You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I assist you?

USER: Kevin Lee here.

ASSISTANT: Nice to meet you Lee.

USER: I want to book a ticket from DCA to PHL to attend my college anniversary, can you help me for booking?

ASSISTANT: Sure, may I know your travel dates please?

USER: Travel starts from 02/17 to 02/19. Make sure with 0 connection.

ASSISTANT: Sorry to say this Lee, there are no flights matching your criteria.

USER: Ok, that's fine. Thank you for your services.

ASSISTANT: Thank you for reaching us. Have a good day.