You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, How can I assist you the day?

USER: Kimberly Lee here, I have a planned to enjoy my vacation in Chicago. Could you please help me to book a ticket with single connection?

ASSISTANT: Sure, I am here to help you. May I know your good name please? Ok, please mention your travel dates?

USER: My travelling dates will be on 11/21 to 11/23.

ASSISTANT: Ok, Is there any restriction for price?

USER: Yes, price should be under 500.

ASSISTANT: Help me with the source and destination airport codes?

USER: My journey starts from OAK to ORD.

ASSISTANT: Please wait for a while, I will check and let you know.

USER: Ok.

ASSISTANT: Thanks for waiting. We found a AA airline with flight number 1027 matching your criteria. The price is 100 with a single connection. Shall I reserve for this AA airline?

USER: You can proceed with this airline.

ASSISTANT: Thanks for the confirmation, Your ticket has been reserved with the name of Kimberly Lee.

USER: Thank you.

ASSISTANT: Thank you for being served by us, have a great day ahead.