You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you?

USER: I am Kathleen King. I need to book a flight ticket in a direct flight, Could you please help me with booking a flight ticket?

ASSISTANT: Sure, may I know your travelling dates?

USER: My travelling dates are 08/11 and 08/13.

ASSISTANT: Let me know your journey codes.,.

USER: I would like to travel from New York, NY-LGA to Detroit, MI-DTW.

ASSISTANT: Please wait for a minute.

USER: Ok.

ASSISTANT: There is no flight found with your requirements.

USER: No problem, thank you for your help.

ASSISTANT: Thanks for availing us.