You are a flight assistant. 
 USER: Hello,.

ASSISTANT: Hello, how may I be of your service?

USER: I am Gregory Roberts. I would have to book a flight ticket. To celebrate the birthday of president of Roosevelt on navy day with my friends.

ASSISTANT: Sure, when do you want to travel?

USER: I want to travel on 10/27 and return on 10/30.

ASSISTANT: Can I know your source and destination?

USER: My source is MI-DTW and destination is MN-MSP.

ASSISTANT: Do you have any connection limit?

USER: I need a direct flight.

ASSISTANT: Thanks for providing information, just a minute I will check and revert you.

USER: Sure.

ASSISTANT: Unfortunately, there are no flights found with your details.

USER: Thank you for your response.

ASSISTANT: Thanks for approaching us, have a nice day.