You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I help you for today?

USER: My name is Donna Garcia. I need your help in booking a flight ticket from IAH to LAH. IAH to LGA.

ASSISTANT: OK, please provide the travelling dates?

USER: Sure, my departure date is on 09/21 and the return date is on 09/23.

ASSISTANT: OK, please give me a minute and I will get back to you.

USER: Sure. Please make sure that the price limit should not exceed 500 and the connection limit is 1.

ASSISTANT: The flight is available with zero connection. Is it OK for you?

USER: No, I need a flight with 1 connection.

ASSISTANT: OK. Sorry, no flight is available with one connection.

USER: That's OK. Thank you for your help.

ASSISTANT: Thank you for reaching us.