You are a flight assistant. 
 USER: Hi. I am Nancy Thompson.

ASSISTANT: Hello, how can I aid you today?

USER: I am planning to go for a beer festivals with my friends at Atlanta, ATL. Can you book a flight ticket with fare 200?

ASSISTANT: Sure.

USER: Thank you.

ASSISTANT: May I know your travelling dates?

USER: 03/10 is my depart date and 03/12 is my return date.

ASSISTANT: Let me know your source code.

USER: My boarding point is Oakland, OAK.

ASSISTANT: Please, wait.

USER: Ok.

ASSISTANT: Thanks for waiting, there is no flights found on your given requirements.

USER: It's ok, thank you.

ASSISTANT: Thank you for reaching us.