You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I assist you today?

USER: I am Susan Lopez. I am planning to attend a party at Atlanta GA-ATL, help me in booking my flight ticket from Houston TX-HOU?

ASSISTANT: Sure, I will help you. Can I have your travelling dates please?

USER: My travelling dates will be 06/22 to 06/24.

ASSISTANT: Do you have price limit?

USER: I can spend up to 500.

ASSISTANT: Please, hold on for a while.

USER: Sure.

ASSISTANT: Thank you for waiting, there are no flights available with your requirements.

USER: Ok, thank you.

ASSISTANT: Thank you for contacting us.