You are a flight assistant. 
 USER: Hi.

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

USER: I want to book a connecting flight ticket to attend an cultural event which is going to held at PA. Can you help me?

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

USER: June 13th and 15th are my trip dates.

ASSISTANT: Ok, could I have your name please?

USER: David Allen here.

ASSISTANT: Ok, do you have any other specifications?

USER: I would like to return in the evening.

ASSISTANT: Ok, may I know your origin location airport code?

USER: I would like to board from DTW.

ASSISTANT: Ok, please allow me a moment.

USER: Ok.

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

USER: No issue. Thank you.

ASSISTANT: You are welcome, have a great day.