You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I help you?

USER: Samuel Young here. I want to attend a Marriage in Minneapolis. Can you please help me for booking the flight ticket?

ASSISTANT: Sure, I will help you.

USER: Thanks.

ASSISTANT: Can you please share your take off airport code?

USER: My airport codes are IAD and MSP.

ASSISTANT: May I know your planned journey dates?

USER: My travelling dates are 12/09 and 12/11.

ASSISTANT: Let me know your connection limit.

USER: I want to travel in single connecting flight.

ASSISTANT: Kindly, mention your class preference.

USER: I want to prefer business class.

ASSISTANT: Do you have any other specifications?

USER: I want to return on evening.

ASSISTANT: Please, wait for a while.

USER: Ok, I will wait.

ASSISTANT: Thank you for waiting, we did not find any flights that matches your requirements.

USER: Anyway, thanks for the information.

ASSISTANT: Thank you for approaching us.