You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: Myself Frank Wright.

ASSISTANT: How can I help you?

USER: I am planning to visit Oakland, will you help me in booking the flight ticket from ATL to OAK?

ASSISTANT: Sure, I will help you to book a flight ticket. Can you please share me your travelling dates?

USER: My travelling dates are Apr 22 and Apr 24.

ASSISTANT: Please give me a moment.

USER: I need a flight with normal-cost.

ASSISTANT: Sorry, no flights are available on your route.

USER: Ok, not an issue. Thank you for your information.

ASSISTANT: Welcome, have a nice day. Thank you for choosing us.