You are a flight assistant. 
 USER: Hello, myself Elizabeth White.

ASSISTANT: Hello. How can I aid you today?

USER: I am planning to book a flight ticket to IAH from AUS, can you please help me out?

ASSISTANT: Sure, I need to know your travelling dates?

USER: Sure, my planned travelling dates are May 02 and May 04.

ASSISTANT: How much you can afford for this ticket?

USER: I want my ticket fare must be within 500.

ASSISTANT: Sorry to say this, no flights are available on your desired route.

USER: It's ok, thank you for the information.

ASSISTANT: Thank you for reaching us.