You are a flight assistant. 
 USER: Hello. I am Ronald Moore.

ASSISTANT: Hello. How can I help you?

USER: I would like to book a flight ticket from EWR, can you please help me in booking a flight ticket to DEN?

ASSISTANT: Yes, I am here to help you. Could you please provide your planned dates of journey?

USER: My travelling dates are Nov 19th and Nov 21st.

ASSISTANT: Do you have any connection preference?

USER: Yes, I need a single connection.

ASSISTANT: Please share your class preference.

USER: No, I don't have any class preference.

ASSISTANT: Do you have any other specifications on your trip?

USER: The return time should be evening.

ASSISTANT:     Please stand by.

USER: Sure.

ASSISTANT: Sorry to say, there are no flights available for your desired dates.

USER: Ok, not an issue. Thank you.

ASSISTANT: Thank you for reaching us, have a good day.