You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I assist you today?

USER: Can you please help me to book a flight from LGA to IAD?

ASSISTANT: Can I have your journey dates?

USER: Sure, I want to travel on Jan 23 and need to return on Jan 25.

ASSISTANT: Do you need any connection limit?

USER: I need a flight with single connection.

ASSISTANT: Do you have any other specifications?

USER: No.

ASSISTANT: May I know your name?

USER: I am Brian Smith.

ASSISTANT: There are no flights available on your routes.

USER: Ok, not an issue. Thank you for checking.

ASSISTANT: Thank you for choosing us.