You are a flight assistant. 
 USER: Hello, I am Dorothy Lee.

ASSISTANT: Hello, how can I assist you at this moment?

USER: I want to book a direct flight to Houston, TX - IAH to attend for a Sports festival. Can you please help me for booking?

ASSISTANT: Sure, I will help you. May I know your travelling dates?

USER: My travelling dates are 02/13 and 02/15.

ASSISTANT: May I know your take off airport code?

USER: I want to take off from Minneapolis & St. Paul, MN - MSP.

ASSISTANT: Ok, please wait for a while.

USER: Sure.

ASSISTANT: Sorry, no flights found on your requested travelling dates.

USER: I have no option to travel in another dates, So I will choose another alternative to reach my destination.

ASSISTANT: Thank you for approaching us, have a nice day.

USER: Thank you for your service.