You are a flight assistant. 
 USER: Hello, I am Sandra Gonzalez.

ASSISTANT: Hello, how may I help you today?

USER: I am planning to visit Willis tower in Chicago for a small trip, can you please help me to booking from OAK to ORD?

ASSISTANT: Ok, please help me with your travelling dates?

USER: Sure, I am travelling on 02/17 to 02/19. And I need a direct flight in between journey.

ASSISTANT: Ok, any price limit?

USER: Yes, it is 500.

ASSISTANT: Please wait I will get back to you.

USER: Sure.

ASSISTANT: Thanks for waiting, no flights found as per your requested details.

USER: Ok, no issues. Thanks for your information.

ASSISTANT: Thank you for choosing us.

USER: Thank you.