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 JFK to BOS?

ASSISTANT: Sure, please share your planned travel dates?

USER: My travel dates are Aug 18 and Aug 20.

ASSISTANT: Do you have any connection limit?

USER: I prefer connecting flight for this trip.

ASSISTANT: Any other preferences?

USER: I would like to depart in the evening time.

ASSISTANT: Can I have your name please?

USER: I am Donna Hall.

ASSISTANT: Sorry, no flights found with your given details.

USER: No problem, thank you for the information.

ASSISTANT: Thank you for opting us.