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

ASSISTANT: Hello, how may I assist you at this moment?

USER: I am planning for an outing at Oakland, can you help me to book a ticket for me?

ASSISTANT: Sure, please share your traveling dates.

USER: I am planning to travel on 11/04 and return on 11/06.

ASSISTANT: Ok, may I know your airport codes please?

USER: Search for the flights between ATL and OAK.

ASSISTANT: Ok, hold on for the moment.

USER: Take your time.

ASSISTANT: I found a flight for you with Delta airline and it costs you 600. Shall I proceed?

USER: I want flight with 200 price.

ASSISTANT: Sorry there are no flights available with the cost 200.

USER: No issues. Thank you for checking.

ASSISTANT: Welcome, thank you for choosing us.

USER: Welcome.