You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How may I aid you?

USER: Can you help me to book flight ticket from IAD to IAH?

ASSISTANT: Sure, I am oblige to help you and can I know desired travel dates?

USER: My trip dates are Sept 3 and Sept 5.

ASSISTANT: On whose name that I have to book the flight ticket?

USER: Patrick Carter here.

ASSISTANT: Can I know your connection limit?

USER: I prefer a connecting flight.

ASSISTANT: Please allow me a moment.

USER: Make sure that my class preference should be business.

ASSISTANT: Sorry, there is no business class flight available on your travel dates.

USER: It's ok, thank you.

ASSISTANT: You are welcome and thank you for reaching us.