You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I assist you?

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

ASSISTANT: Sure, may I know your planned travel dates please?

USER: My travelling dates will be on June 30 to July 2.

ASSISTANT: Would you like to travel in a connecting flight or a direct flight?

USER: I would like to travel in a connecting flight.

ASSISTANT: Do you have any particular time for departing and returning?

USER: No.

ASSISTANT: Do you have any other specifications?

USER: No.

ASSISTANT: May I know your good name please?

USER: Ronald Allen here.

ASSISTANT: Sorry, there is no flight available on your requested dates.

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

ASSISTANT: You are welcome.