You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. What can I do for you?

USER: I would like to meet my brother at Chicago, could you please help me in booking a ticket?

ASSISTANT: Sure, on what dates you want to travel to Chicago?

USER: My travel dates are from 02/07 to 02/09.

ASSISTANT: May I know your source airport code please?

USER: My source and destination airport codes are OAK and ORD.

ASSISTANT: Ok, let me check is there any flight available or not.

USER: Ok.

ASSISTANT: There is no flight available to Chicago on 02/07. Please share your name?

USER: Ok, no problem, my name is Kenneth Garcia.

ASSISTANT: Thanks for utilizing our services.

USER: Thank you.