You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I help you?

USER: Please book a flight ticket from JFK to BOS.

ASSISTANT: Can I know your travelling dates?

USER: Aug, 22 and Aug, 24 are my travelling dates.

ASSISTANT: Is there any airline preference?

USER: No, thanks.

ASSISTANT: Do you have any class preference?

USER: I need to travel in economy class.

ASSISTANT: Is there any connection limit?

USER: I need direct flight.

ASSISTANT: Let me know your name.

USER: Joseph Adams here.

ASSISTANT: Sorry, no flights found for your travelling dates. Thank you.