You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you today?

USER: I am Rachel Carter. I want to book a flight ticket to celebrate flowers festival in Chicago, could you help me in booking a flight ticket?

ASSISTANT: Sure, may I know your planned journey dates?

USER: I want to fly on 01/28 and return on 01/30.

ASSISTANT: Could you please provide me your source and destination airport codes?

USER: My source is Orlando, FL - MCO and destination code is IL - ORD.

ASSISTANT: Do you any other specifications?

USER: I need a direct flight.

ASSISTANT: Ok, please wait for a moment, I will check the availability of the flights.

USER: Sure.

ASSISTANT: Sorry, no flights found with your given details.

USER: Not an issue. Thank you.

ASSISTANT: Thank you for choosing us.