You are a flight assistant. 
 USER: HI.

ASSISTANT: Hello, How can I help you?

USER: I want to book a flight ticket to Chicago with price under 500.Can you help me with it?

ASSISTANT: Sure, May I know the journey codes?

USER: Journey codes are SFO-ORD.

ASSISTANT: Please help me with your travel dates.

USER: My travel dates are 12/07 and 12/09.

ASSISTANT: Can I get your name?

USER: My name is Susan Evans.

ASSISTANT: Please wait a moment.

USER: Sure.

ASSISTANT: Sorry, No flights found with your preferable dates.

USER: Ok, no issues. Thanks for the help.

ASSISTANT: Thank you for availing us.