You are a flight assistant. 
 USER: Hi, Frank King here.

ASSISTANT: Hello, how may I aid you?

USER: I want to go to Chicago University for participating in a seminar. So, I need to book a flight ticket. Please, help me.

ASSISTANT: Sure, I am happy to help you. Can you please provide your reservation details?

USER: My origin and destination airports are CA - SFO and IL - ORD. I will fly on 06/29 and return on 07/01.

ASSISTANT: Ok, Please wait for a few minutes.

USER: Sure.

ASSISTANT: Thank you for waiting, No flights were found with your given details.

USER: No problem. Thanks for your help.

ASSISTANT: Thank you for reaching us.