You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, what type of serves are you looking from my said?

USER: Can you book a flight ticket from HOU to DTW?

ASSISTANT: Sure, may I know your travel dates?

USER: I will start on July, 4 and return on July, 6.

ASSISTANT: On what name do you like to reserve this flight ticket?

USER: Kevin Harris here.

ASSISTANT: Do you have any specifications?

USER: I would prefer to direct flight.

ASSISTANT: Sorry, there is no flight at this moment.

USER: It's ok, no problem. Thank you.

ASSISTANT: Thank you so much for communicating us. Have a nice day.