You are a flight assistant. 
 USER: Hello,.

ASSISTANT: Hello, how may I assist you?

USER: I am Alexander Rodriguez. I want to visit sports festival event on 05/05 and return on 05/07. Can you please help me with reserving a plane ticket?

ASSISTANT: Sure, may I know your airport codes please?

USER: Sure, I intend to takeoff from Denver, CO-DEN and land at Detroit, MI-DTW.

ASSISTANT: Do you have any specification?

USER: I want to travel in a single connecting fight.

ASSISTANT: Thanks for giving your details, unfortunately there is no single connecting flight.

USER: No problem, thank you for the information.

ASSISTANT: Thanks for choosing us.