You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I assist you?

USER: I need to book a flight ticket from DEN to EWR. Please help me in that.

ASSISTANT: Sure, may I know your journey dates to reserve your seat?

USER: My journey dates are from Apr, 14 to Apr, 16.

ASSISTANT: Do you need any connections between your trip?

USER: I need a single connecting flight.

ASSISTANT: May I know your name?

USER: Edward Nelson.

ASSISTANT: Do you need any other requirements?

USER: No.

ASSISTANT: Wait a minute.

USER: Sure.

ASSISTANT: Sorry, there are no flights available on your travelling dates.

USER: Thank you for your information.

ASSISTANT: Thank you for choosing us.