You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I aid you at this moment?

USER: Assist me in booking a flight ticket from HOU to MSP.

ASSISTANT: Sure, may I know your travelling dates?

USER: I preferred to travel in between Aug 19 and Aug 21.

ASSISTANT: Ok, do you prefer business or economy class?

USER: No, but make sure a connected flight is required.

ASSISTANT: Ok, may I know your good name please?

USER: I am Patricia Thomas.

ASSISTANT: There are no flights found on your requested dates.

USER: Ok, no problem. Thanks for communicating.

ASSISTANT: Thank you for reaching us.