You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I help you today?

USER: Can you help me to book a flight ticket from BOS to PHL?

ASSISTANT: Sure, can you share me your trip dates?

USER: Sure, my planed travel dates are Dec 19 and Dec 21.

ASSISTANT: Is there any connection limit?

USER: I am looking for a connecting flight.

ASSISTANT: Do you have any other specifications?

USER: I prefer business class flight.

ASSISTANT: Can I have your good name?

USER: Myself Larry Thompson.

ASSISTANT: Sorry, no flights are found on your trip dates.

USER: That's fine, no problem. Anyway thank you for checking.

ASSISTANT: Thank you for reaching us.