You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I help you out?

USER: I am Angela Harris. I need to book a flight ticket from JFK to DEN. Please help me in booking a flight ticket.

ASSISTANT: Sure, I will help you in booking the ticket. May I know your travelling dates please?

USER: My travelling dates are from 04/21 to 04/23.

ASSISTANT: Do you need any specifications?

USER: I need to depart in the morning and I need a single connecting flight.

ASSISTANT: Sorry, there are no flights found.

USER: No problem, thanks for your information.

ASSISTANT: Thank you for reaching us.