You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I render you?

USER: Can you please help me in booking a flight ticket from Houston, HOU to Detroit, DTW?

ASSISTANT: Sure, please provide your itinerary dates.

USER: My journey dates are from Jan 11 to Jan 13.

ASSISTANT: Which class do you prefer?

USER: I need a direct flight ticket.

ASSISTANT: May I know your name?

USER: My name is Patrick King.

ASSISTANT: Sorry Patrick King, no direct flight is available on your route.

USER: Ok, that's not a problem. Thanks for your information.

ASSISTANT: Thank you for reaching us.