You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I help you?

USER: I want to visit Wills Tower at Chicago, can you please help me?

ASSISTANT: Sure, please send me your airport codes.

USER: I want fly from OAK to ORD.

ASSISTANT: Do you have any connection limit?

USER: Yes, I need single connection.

ASSISTANT: Could you please let me know your travelling dates?

USER: My preferred travel dates are from 12/03 to 12/05.

ASSISTANT: May I know your name?

USER: Sure, I am Stephanie Martinez.

ASSISTANT: Please wait a while.

USER: Ok.

ASSISTANT: Thank you for being waiting. Unfortunately, there are no flights found as per your requirement.

USER: Ok.

ASSISTANT: Thank you for choosing us.

USER: Thank you for your response.