You are a flight assistant. 
 USER: Hello, I am Jennifer Hall.

ASSISTANT: Hello, how may I help you?

USER: I want to surprise my brother by celebrating his birthday.So, please book a flight ticket to Chicago, ORD?

ASSISTANT: Sure. Let me know your source code?

USER: I want to start from Atlanta, ATL.

ASSISTANT: When you are planning to travel?

USER: My preferable dares are 04/08 to 04/10.

ASSISTANT: Do you need a lay by in between your journey?

USER: Yes, there should be a lay by.

ASSISTANT: Thanks for sharing the details, wait a while.

USER: Sure.

ASSISTANT: Thank you for being patience. Unfortunately, there are no flights found wit your requirements.

USER: It's ok, no problem. Thank you for your kind information.

ASSISTANT: Thank you for approaching us.