You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I assist you?

USER: Please help me out in booking the ticket from SFO to DTW.

ASSISTANT: Sure, may I know your planned travel dates please?

USER: My trip dates will be Apr 20 to Apr 22.

ASSISTANT: Would you like to travel in a connecting flight or a direct flight?

USER: I want a connecting flight.

ASSISTANT: Do you have any particular time for departing and returning?

USER: No.

ASSISTANT: May I know your good name please?

USER: Laura Hall is my name.

ASSISTANT: Do you have any class preference?

USER: No.

ASSISTANT: Do you have any airline preference?

USER: Not required.

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

USER: That's ok, thank you.

ASSISTANT: Thank you for reaching us.