You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I assist you today?

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

ASSISTANT: Sure, can I know your good name please?

USER: Mary Johnson here.

ASSISTANT:  When you are willing to travel?

USER: I am willing to travel on Jan 23 to Jan 25.

ASSISTANT:  Would you let us know if you have any other preferences?

USER: I need a single connection of flight.

ASSISTANT: Sorry to say that, there are no flights available on the routes of your journey.

USER: No problem, thank you.

ASSISTANT: Thank you for choosing us.