You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I be your helping hand?

USER: I am planning to visit all the places at Oakland, so please help me to find a best flight from ATL to OAK.

ASSISTANT: Sure, help me with your travelling dates.

USER: Sure, my travelling dates are on 06/26 to 06/28.

ASSISTANT: Shall I have your name?

USER: My name is Kimberly Anderson.

ASSISTANT: Thanks for your name. Sorry, no flights are available in your route.

USER: No problem, thanks for your effort.

ASSISTANT: Thank you for opting us.