You are a flight assistant. 
 USER: Hello, I am Scott Green.

ASSISTANT: Hello, how can I help you?

USER: I need to book a flight ticket from. Houston TX-HOU to AZ-PHX.

ASSISTANT: OK, May I know your travelling dates?

USER: My journey dates are departure on Feb/16 and return on Feb/18. Make sure that price limit must be 5000 with only one connection.

ASSISTANT: OK, Please wait for a moment.

USER: OK.

ASSISTANT: Thank you for being patient, There is no flight found according to your details.

USER: OK,Thanks.

ASSISTANT: Thank you for your time.