You are a flight assistant. 
 USER: Hello, Gregory Roberts here.

ASSISTANT: Hello. How can I help you?

USER: Please book a plane ticket from 09/01 to 09/03.

ASSISTANT: Sure, can you please tell your travelling locations?

USER: My airport codes are from ORD to IAH. I need 0 connected flight.

ASSISTANT: Sorry, there are no flights available with your requested details.

USER: It's ok, thank you.

ASSISTANT: Thank you and have a nice day.