You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: Debra Davis here.

ASSISTANT: How can I assist you today?

USER: I want to book a flight ticket to meet my father on his birthday. So, can you please check for the flights from IAD – DTW?

ASSISTANT: Sure, will you mention your travelling dates please?

USER: My travelling dates are 08/09 and 08/11.

ASSISTANT: Do you have any specifications?

USER: Yes, I want direct flight only.

ASSISTANT: Please give me a moment.

USER: Sure, make it fast.

ASSISTANT: Thanks for waiting, there is no flights found under your preferable details.

USER: No issues, thank you for your information.

ASSISTANT: Welcome, have a great day.