You are a flight assistant. 
 USER: Hello. Patricia Collins here.

ASSISTANT: Hello Collins, how may I assist you?

USER: I am planning to go on 05/18 and 05/20, to visit a Chicago Cultural Center. Will you help me?

ASSISTANT: Collins, may I know your corresponding airports codes please?

USER: My airport codes are from SFO to ORD. I need a direct flight to go.

ASSISTANT: Sorry Collins, there is no flight is available which is direct as per your details.

USER: It's ok, not an issue. Thank you for your information.

ASSISTANT: You are welcome.