You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I aid you?

USER: I am Catherine Baker. I want to book my flight to attend a seminar on robotics, help me in booking my flight ticket from DC-IAD to MN-MSP.

ASSISTANT: Sure, I will help you. Please share me your trip dates?

USER: My trip dates will be 06/20 to 06/22.

ASSISTANT: Do you have any other requirements?

USER: I need a direct flight.

ASSISTANT: Please wait for a while.

USER: Sure.

ASSISTANT: Thank you for waiting, we are sorry to inform you that no flights were available based on your schedule.

USER: Its ok, thank you.

ASSISTANT: Thank you for choosing us.