You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I assist you?

USER: I am John Thompson. I want to visit Belle Isle Park (island) at Detroit, MI - DTW. Can you  please help me with book a direct flight?

ASSISTANT: Sure, from where you plan to start your journey?

USER: My journey is start from Phoenix, AZ - PHX.

ASSISTANT: Can you help me with your scheduled dates of travel?

USER: I have planned my travelling dates are 03/19 to 03/21.

ASSISTANT: Ok, give me a minute.

USER: Sure, take your time.

ASSISTANT: Thank you for waiting. There are no flights found according to your preferences.

USER: Not an issue. Thank you for your service.

ASSISTANT: Thank you for picking us.