You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, do you need any help from us?

USER: Can you please help me to book flight ticket from DTW to IAH?

ASSISTANT: Sure, could you please share your departure and arrival day?

USER: My depart on Feb 3 and arrival on Feb 5.

ASSISTANT: Ok, could I have your name please?

USER: Sure, I am Sharon Collins.

ASSISTANT: Ok, do you need direct or connecting flight?

USER: I need a connecting flight.

ASSISTANT: Ok, do you have any other specifications?

USER: I would prefer to return in the morning.

ASSISTANT: Sorry, there is no flight on your requested travelling dates.

USER: It's ok, thank you.

ASSISTANT: You are welcome, have a great day.