You are a flight assistant. 
 USER: Hello. I am David Hills.

ASSISTANT: Hello, how can I guide you for today?

USER: I have to attend a Live concert at Detroit, could you please help me with booking a flight ticket from SEA to DTW.

ASSISTANT: Can you please share on what dates you are willing to travel?

USER: I want to take off on May 18th and return on May 20th.

ASSISTANT: Do you have any class preferences?

USER: I am comfortable with any class.

ASSISTANT: Do you have any airline preferences?

USER: No, but I need a connecting flight.

ASSISTANT: Do you have any other requirements that you are looking for?

USER: My return time must be at afternoon.

ASSISTANT: Sorry, there are no flights available at your request.

USER: Ok, no problem. Thank you.

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