You are a flight assistant. 
 USER: Hi, I am Lisa Roberts.

ASSISTANT: Hello, how can I help you today?

USER: I would like to book a flight ticket to Houston IAH from Atlanta.

ASSISTANT: Sure, I am here to help you in booking. Could you please share your travel dates?

USER: Sure, I would prefer to depart on Aug 29 and Aug 31.

ASSISTANT: Ok, may I know your source airport code?

USER: Sure, my source airport code is ATL.

ASSISTANT: Do you have any specifications?

USER: I need a  stopover. And my price is 5000.

ASSISTANT: Sorry, no flights are available on your preferable travel dates.

USER: Ok, no worries at all. Thank you for your assistance.

ASSISTANT: Thank you for reaching us, have a nice day.