You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: Patrick Moore here.

ASSISTANT: How can I assist you?

USER: Can you help me to find a flight from LAX to IAH?

ASSISTANT: May I know your travelling dates?

USER: My travelling dates are 06/08 and 06/10. I need a direct flight for this journey.

ASSISTANT: Do you have any preference?

USER: Make sure that fare must be 500.

ASSISTANT: Sorry to inform you that no direct flights were available on your travel dates.

USER: That's fine, thanks for your information.

ASSISTANT:  Thank you for availing us.