You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you today?

USER: I want to book a flight ticket from EWR to BOS. Could you help me in booking?

ASSISTANT: Sure, I am here to help you in booking. Can you please share your travel dates?

USER: My travelling dates are from Dec 06-08.

ASSISTANT: Ok, may I know your name?

USER: Sarah Lewis here.

ASSISTANT: Do you have any specification?

USER: I need direct flight and I prefer for economy class.

ASSISTANT: Sorry, no flights are available on your preferable travel dates.

USER: That's ok, no problem. Thank you.

ASSISTANT: Thank you for reaching us, have a nice day.