You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, How can I help you?

USER: Please help me in booking flight ticket from DCA to PHL to meet my friends.

ASSISTANT: Sure, May I know your travelling dates?

USER: My trip dates are Aug 22 to Aug 24.

ASSISTANT: Do you have any connection limit?

USER: I prefer to travel in connecting flight.

ASSISTANT: May I know your name?

USER: Michael Lopez.

ASSISTANT: Sorry, there are no flights found with your details.

USER: Ok, no problem. Thank you.

ASSISTANT: Thank you.