You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I serve you?

USER: I would like to book a ticket from BOS to JFK, can you please help me out?

ASSISTANT: Sure, I will help you. Please send your travelling dates.

USER: I am travelling on these dates Feb 11th and 13th.

ASSISTANT: Do you have any preferences?

USER: I need single connected flight. I don't have any other preferences.

ASSISTANT: May I know your name please?

USER: Betty King here.

ASSISTANT: Sorry, there is no flight available with your requirements.

USER: Ok no problem, thank you for your services.

ASSISTANT: You are welcome, have a nice day.