You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I help you?

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

ASSISTANT: Sure, please share your journey dates?

USER: My trip dates are Oct 22 and Oct 24.

ASSISTANT: Do you have any specifications?

USER: I prefer a connecting flight.

ASSISTANT: Is there any class preference?

USER: No.

ASSISTANT: May I know your good name?

USER: I am Ruth Mitchell.

ASSISTANT: Sorry, no flights found on your given details.

USER: It's ok, thank you.

ASSISTANT: Thank you for choosing us.