You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, How can I help you?

USER: I am Thomas Lewis. I need a direct flight from Chicago, to celebrate the flower festival.Can you please help me in booking a flight ticket?

ASSISTANT: Sure, I will help you. May I know your travelling dates?

USER: My travelling dates are Dec 19th and Dec 21st.

ASSISTANT: Where you want to travel?

USER: I want to travel from ORD to LAX.

ASSISTANT: Do you have any preferences?

USER: I need a direct flight.

ASSISTANT: Thanks for your details. There are no flights found on your data.

USER: Ok, no problem. Thank you.

ASSISTANT: Thank you.