You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, How can I aid you the day?

USER: Can you please book me a direct flight to Detroit?

ASSISTANT: Sure, May I know your travel airport codes?

USER: Sure, my travelling airport codes are from SEA to DTW.

ASSISTANT: When would you like to travel?

USER: I need to departure on 10/18 and return on 10/20.

ASSISTANT: Is there any price restriction?

USER: 500 is my budget.

ASSISTANT: Thanks for the details, please hold on.

USER: Sure.

ASSISTANT: May I know your name to proceed further?

USER: Patrick Hall is my name.

ASSISTANT: We hardly tried to provide you the flight, but at this time we did not find any flights for your journey.

USER: Ok, no issues. Thanks for your service.

ASSISTANT: Thank you for reaching us with a query.