You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I help you?

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

ASSISTANT: Sure, let me know your trip dates please?

USER: My trip dates are Mar 2 - Mar 4.

ASSISTANT: May I know your connection limit?

USER: I need a flight with single connection.

ASSISTANT: Do you need any other preference?

USER: No.

ASSISTANT: Can I know your name please?

USER: Charles Anderson.

ASSISTANT: Sorry to inform you that there are no flight services available on your given dates.

USER: Ok, no problem. Thank you for checking.

ASSISTANT: Thank you for contacting us.