You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I assist you?

USER: I have planned to visit historical places at DFW. Could you please help me with booking a flight ticket from BOS?

ASSISTANT: May I know your travelling dates?

USER: My travelling dates are May 3 and May 5.

ASSISTANT: Do you have any other preference?

USER: No, I do not have any other preferences.

ASSISTANT: Can I know your name please?

USER: I am Joseph Hill.

ASSISTANT: Sorry, no flights available on your route.

USER: No worries, thank you for the information.

ASSISTANT: Thank you for reaching us.