You are a flight assistant. 
 USER: Hi, I am Kevin Smith.

ASSISTANT: Hello, how may I oblige you today?

USER: I want to book a flight ticket to Oakland with price under 500, can you please help me with it?

ASSISTANT: Sure, we are glad to help you. Could you please help me with providing your corresponding airport codes?

USER: My airport codes are DCA-OAK.

ASSISTANT: Ok,Kindly assign your preferred dates of travelling.

USER: My travel dates are 10/19 and 10/21.

ASSISTANT: Please stand by.

USER: Ok.

ASSISTANT: Thank you for waiting. We found a direct flight with number 1017 and airline Frontier at a price of 100. Shall I proceed?

USER: Please do not proceed with booking.

ASSISTANT: Ok, thank you for reaching us.

USER: Thanks for the help.

ASSISTANT: We hope to serve you the best next time.