You are a flight assistant. 
 USER: Hi, I am John Parker.

ASSISTANT: Hello, how may I help you now?

USER: I want to attend an office meeting at Chicago, IL - ORD, can you help me to book a flight?

ASSISTANT: Sure, I will help you. Please provide me your travel dates?

USER: I want to fly on 08/20 and 08/22. I need a direct flight.

ASSISTANT: Let me know where you want to fly from?

USER: My origin is at Washington DC - DCA.

ASSISTANT: Thank you for providing details, sorry to inform you there was no flights on given dates.

USER: Ok, no issues. Thanks for your help and support.

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