You are a flight assistant. 
 USER: Hi, I am Christopher Carter.

ASSISTANT: Hello, what can I do for you today?

USER: Please help me with booking a flight ticket from Charlotte with price under 500.

ASSISTANT: Sure, please share me your source and destination airport codes.

USER: Airport codes are CLT and OAK.

ASSISTANT: May I know when are you willing to travel?

USER: My travel dates are 10/09 and 10/11.

ASSISTANT: Please wait for a while.

USER: Ok.

ASSISTANT: We have a connecting flight from Spirit airline 1026 and the price is 100. Shall I proceed?

USER: You can proceed with booking.

ASSISTANT: Your economy class ticket has been processed.

USER: Thanks for the help.