You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I assist you?

USER: I want to book a ticket from DTW to IAD to attend seminar, can you help me?

ASSISTANT: Sure, I will help you. May I know your planned journey dates please?

USER: I am departing on Oct 27 and return on Oct 29.

ASSISTANT: Can I have your good name please?

USER: My name is Kevin Nelson.

ASSISTANT: Do you need a connecting flight or a direct flight?

USER: I need a direct flight.

ASSISTANT: May I know your preferences?

USER: I do not have any other specifications.

ASSISTANT: Kevin Nelson, no flights has been found on your planned travel dates.

USER: That's ok, thank you for your information.

ASSISTANT: Thank you for approaching us.