You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you?

USER: Can you help me to book a flight ticket from DCA to LGA?

ASSISTANT: Sure, I am here to help you for this. When are you planning your trip?

USER: My trip dates are Mar 17 and Mar 19.

ASSISTANT: May I know your name please?

USER: I am George Taylor.

ASSISTANT: Do you have any specifications regarding your journey?

USER: I prefer connecting flight for this trip.

ASSISTANT: Is there any other criteria?

USER: No.

ASSISTANT: Please wait for a while.

USER: Sure.

ASSISTANT: Sorry for inconvenience, no flights are found with your requirements.

USER: No problem, thank you for the information.

ASSISTANT: Thank you very much for contacting our agency.