You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I help you?

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

ASSISTANT: Please provide your journey dates in order to book a ticket?

USER: My trip dates are Mar 16 and Mar 18 respectively.

ASSISTANT: Is there any airline preference?

USER: No, but I prefer for a connecting flight to travel.

ASSISTANT: May I know your name?

USER: Kevin Carter here.

ASSISTANT: Sorry, there are no flights with your travelling dates.

USER: Thank you for the help.

ASSISTANT: Thank you.