You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How may I help you out?

USER: Can you help me to book a flight from IAD to DTW?

ASSISTANT: Sure, I will help you in booking the ticket. May I know your travelling dates please?

USER: My travelling dates are Jan 03 and 05.

ASSISTANT: Can I know your name please?

USER: My name is Paul Green.

ASSISTANT: Do you need any specifications?

USER: I want direct flight.

ASSISTANT: Can I know your preferences?

USER: I did not have any requirements.

ASSISTANT: Sorry, there are no flights found.

USER: No issues, thank you for your response.

ASSISTANT: Thank you for reaching us.