You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How may I assist you?

USER: Can you please help me in booking a direct flight ticket to DTW from IAD?

ASSISTANT: Sure, I am here to help you out. May I know your airline preference?

USER: I would like to travel in normal cost airlines.

ASSISTANT: Can you please share your connection limit?

USER: I need a connecting flight.

ASSISTANT: May I know your travelling dates please?

USER: My planned dates of travel are from Oct 21 to Oct 23.

ASSISTANT: Do you have any other specifications?

USER: Sorry, I need a direct flight.

ASSISTANT: May I know your name please?

USER: I am Thomas Lopez.

ASSISTANT: Wait a moment please.

USER: Ok.

ASSISTANT: Thomas Lopez, there are no flights available in your route. Thank you for choosing us.

USER: Ok, no problem. Thank you.