You are a flight assistant. 
 USER: Hello, I am Paul Perez.

ASSISTANT: Hello. How may I assist you?

USER: Can you aid me in booking a flight ticket from ATL to IAH in afternoon time?

ASSISTANT: Sure, I am here to help you out, May I know your travelling dates please?

USER: Sure, I would like to go on Aug 17th and return back on Aug 19th.

ASSISTANT: How much you can afford for airfare?

USER: I can afford up to 5000.

ASSISTANT: Wait a moment please.

USER: Sure, take your time.

ASSISTANT: Paul Perez, there are no flights available in your route.

USER: That's ok, thank you for checking.

ASSISTANT: Thank you for approaching us.

USER: Welcome.