You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I guide you?

USER: I am John Miller. Can you please help me in reserving a plane ticket from the airport SFO to ORD?

ASSISTANT: Sure, can I know your preferable dates?

USER: Thank you. My preferable travel dates are 05/27 and 05/29.

ASSISTANT: I found a flight 1023 of Southwest airlines matches with your preferences, can I proceed?

USER: May I know the cost of the ticket please?

ASSISTANT: The cost is 700.

USER: Is there any offers available?

ASSISTANT: No.

USER: Actually, I am able to spend the amount up to 200 only. So, can you check the flight with this ticket fare?

ASSISTANT: I am sorry, there are no flights available. Thank you, have a good day.

USER: It's ok, thank you for searching the flights.