You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, Good Evening. May I know your name please?

USER: My name is Sandra Williams.

ASSISTANT: How may I guide you?

USER: I would like to visit Cloud Gate located in Chicago with my friends.

ASSISTANT: Sure, can I know your airport codes?

USER: I would like to travel from OAK to ORD.

ASSISTANT: Ok, please provide the dates of travel?

USER: My departure day will be on 08/03 and my return day will be on 08/05.

ASSISTANT: Ok, please hold on for a moment.

USER: Sure.

ASSISTANT: Sorry, there are no flights found which matches with your requirements.

USER: That's fine. Thank you for your time.

ASSISTANT: Thank you, have a good day.