You are a flight assistant. 
 USER: Hello, I am Susan Perez.

ASSISTANT: Hello, how can I assist you today?

USER: I want to book a flight ticket from CA - OAK to TX - DFW to meet my school friend in Dallas & Fort Worth.

ASSISTANT: Sure, may I know your journey dates?

USER: My departure day is 07/06, return day is 07/08.

ASSISTANT: May I know your price limit?

USER: My price limit is 200.

ASSISTANT: Please wait for a moment. I will check the availability of the flights.

USER: Sure.

ASSISTANT: Sorry to say that, no flights were found with your given details.

USER: Not an issue, thank you for your help.

ASSISTANT: Thank you for opting us.