You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I aid you?

USER: Can you please help me to book a ticket from DEN to JFK?

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

USER: My trip dates will be on Sept 13 to Sept 15.

ASSISTANT: May I know your connection limit?

USER: I need a connecting flight.

ASSISTANT: Do you have any other preference?

USER: No.

ASSISTANT: Can I know your name please?

USER: Emma Green here.

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

USER: Ok, not an issue. Thank you.

ASSISTANT: Thanks for contacting us.