You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I help you?

USER:  Help me in booking a flight form DTW to HOU?

ASSISTANT: Sure, I am here to help you. Can you please let me know your travelling dates?

USER: I want to depart on July 4 and need to return on July 6.

ASSISTANT: Do you have any other specifications?

USER: I need a direct flight.

ASSISTANT: May I know your good name?

USER: Charles Williams here.

ASSISTANT: Sorry, no flights are available on your journey routes.

USER: Ok, not an issue. Thank you for the information.

ASSISTANT: Thank you for choosing us.