You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I assist you?

USER: I am planning to attend music concert at ORD, can you please help me with booking a flight ticket from SFO?

ASSISTANT: Sure, can you please share your travelling dates?

USER: Sure, I would like to take off on Apr 22 and return on Apr 24.

ASSISTANT: Please share your connection limit.

USER: I need a flight with 1 connection.

ASSISTANT: Do you have class preference?

USER: I prefer economy class.

ASSISTANT: Is there any other requirements?

USER: I would like to depart evening time and return afternoon time.

ASSISTANT: May I know your name?

USER: My name is Kenneth Wilson.

ASSISTANT: Sorry, there are no flights found based on your details.

USER: Ok, no issues. Thank you for checking.

ASSISTANT: Thank you for choosing us.

USER: You are welcome.