You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, How can I assist you?

USER: Mary Turner here. I was planning to visit DTW, So, can you check for the flights from IAD?

ASSISTANT: Sure, May I know the travel dates?

USER: My travelling dates are on Sept 30 and Oct 02. I need a direct flight only.

ASSISTANT: Please wait a minute.

USER: Sure.

ASSISTANT: Sorry, No flights found with your preferable dates.

USER: Oh! Than's sad to know. Anyways, thank you for checking.

ASSISTANT: Thank you for opting us.

USER: Most welcome.