You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I render you today?

USER: I am Cynthia Moore. I am looking for a direct flight from ORD to MSP, can you please help me to book a flight ticket?

ASSISTANT: Sure, can you please share your trip dates?

USER: Sure, my travelling dates are Aug 26 and Aug 28.

ASSISTANT: Is there any class preference?

USER: I am comfortable to travel in any class.

ASSISTANT: Do you have any other requirements?

USER: My departing time is evening.

ASSISTANT: Ok, please wait for a moment.

USER: Sure, take your own time.

ASSISTANT: Sorry, there were no flights with your specific requirements.

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

ASSISTANT: Thank you for contacting us.