You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Patrick Robinson.

ASSISTANT: Is there any help that you are expecting from my side?

USER: I need to attend my sister marriage at Detroit, can you please help me to book a flight ticket from LAX to DTW?

ASSISTANT:  Sure, can you please mention your departure and arrival dates of your journey?

USER: Sure, my travelling dates are Feb 05 and Feb 07.

ASSISTANT: Sure, is there any another specifications on your trip?

USER: I need a direct flight.

ASSISTANT: Sorry, there is no flight found with your requirement. Welcome, thank you for approaching us.

USER: That's ok, thank you for your information.