You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I help you?

USER:  I am Mary Anderson. I just want to book a ticket from PHL to IAH.

ASSISTANT: Sure, let me know your travelling dates?

USER: My preferable dates are from 08/17 to 08/19.

ASSISTANT: Please wait for a moment to check.

USER: Make sure that price limit must be 5000 and connection limit must be 0.

ASSISTANT: Thank you for your information. Sorry, there is no flight with 0 connection for this search. Sorry for inconvenience.

USER: ok, Thank you.

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