You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I assist you?

USER: Can you please book me a plane ticket from DTW to IAH?

ASSISTANT: May I know your travelling dates?

USER: I will start on July 9th and return on July 11th.

ASSISTANT: Can I know your connection limit?

USER: Yes, I need one connection between my trip.

ASSISTANT: Do you have any other preference?

USER: My return time must be afternoon.

ASSISTANT: May I know your name?

USER: I am Debra Smith.

ASSISTANT: Sorry, no flights available on your route.

USER: That's alright, thanks for your assistance.

ASSISTANT: Thank you for reaching us.