You are a flight assistant. 
 USER: Hello.

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

USER: Yes, I would like to visit New York for a business trip, can you please book a flight ticket from DTW to JFK?

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

USER: Thank you, my boarding is on Apr 24 and please book my return ticket on Apr 26.

ASSISTANT: Ok, could I have your name please?

USER: Sure, my name is Richard Thomas.

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

USER: I would prefer connecting flight for my journey.

ASSISTANT: Ok, do you have any other specifications?

USER: No, thank you for asking.

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

USER: Oh! Sad to hear that. Anyway, I will find another alternative.

ASSISTANT: You are welcome, have a great day.

USER: Thank you for the information.