You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you now?

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

ASSISTANT: Sure, I can book a ticket for you.

USER: Thank you.

ASSISTANT: May I know when you are willing to travel?

USER: Journey dates are Dec 13 to Dec 15.

ASSISTANT: Thanks for the information. Sorry, unfortunately no flights are available on your desired route.

USER: No problem.

ASSISTANT: May I know your name for documentation purpose?

USER: I am Brian Perez.

ASSISTANT: Thank you for reaching us, have a nice day.

USER: Thank you.