You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I aid you?

USER: Can you please help me in booking a flight ticket from IAD to BOS?

ASSISTANT: Sure, I am here to help you. May I know your trip dates?

USER: Sure, my travel dates are from Dec 31 to Jan 02.

ASSISTANT: Do you have any connection limit preference?

USER: Yes, I am looking for a connecting flight.

ASSISTANT: Do you have any specific time concern?

USER: No.

ASSISTANT: Could you help me with your name please?

USER: Myself Eric Lopez.

ASSISTANT: Thank you for your details. Regret to inform that there is no flight available for the mentioned dates.

USER: That's ok, no issues. Thank you for the information.

ASSISTANT: Thank you for reaching us.