You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you?

USER: I want to visit Atlanta. Please help me in booking my ticket from Oakland.

ASSISTANT: Can I know your trip dates?

USER: My trip dates are from 04/03 to 04/05.

ASSISTANT: Do you have any other requirements?

USER: Yes, I prefer economy class and I need a direct flight.

ASSISTANT: Ok, please wait a minute.

USER: Sure.

ASSISTANT: May I know your name?

USER: My name is Donna Miller.

ASSISTANT: Sorry Donna, there is no flights available on these route.

USER: It's ok, thank you for your help.

ASSISTANT: Most welcome.