You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How may I assist you today?

USER: I am William Thomas, can you help me to book a flight within 500 price limit?

ASSISTANT: May I know your journey dates please?

USER: My planned dates are 02/26 and 02/28.

ASSISTANT: Could you please help me with your airport codes?

USER: My airport codes are OAK and SEA.

ASSISTANT: Please give me a moment.

USER: Ok.

ASSISTANT: There is a flight found with an airline Spirit of flight 1013 and fare is 100. Would you like me to proceed?

USER: Yes, you can proceed.

ASSISTANT: Your ticket has been confirmed.

USER: Thank you.

ASSISTANT: Thank you for choosing us.