You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I assist you?

USER: Can you aid me to book my ticket from BOS to SFO?

ASSISTANT: Sure, I will help you. May I know your planned travel dates please?

USER: My trip dates are Mar 31 and Apr 02 respectively.

ASSISTANT: Can I have your name please?

USER: Anthony Evans here.

ASSISTANT: Do you need a connecting flight?

USER: I prefer for direct flight to travel.

ASSISTANT: May I know your class preference?

USER: No class preferences for me.

ASSISTANT: Do you have any other specifications?

USER: No other preferences for me.

ASSISTANT: Anthony Evans, no flights has been found on your planned travel dates.

USER: No issue. Thank you for the help.

ASSISTANT: Thank you for choosing us.