You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I aid you now?

USER: I am Helen Perez. I want to book a flight ticket from HOU to ORD. Could you help me in booking?

ASSISTANT: Sure, may I know your travel dates please?

USER: My travelling dates are from July 30 to Aug 01.

ASSISTANT: Let me know about your price limit to proceed further.

USER: I can spend 1000.

ASSISTANT: Ok, please wait for a while.

USER: Ok, please check with direct flight.

ASSISTANT: Ok. Sorry, there is no flight available as per your requirements.

USER: That's ok, no problem. Thank you.

ASSISTANT: Thank you for availing us.