You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I assist you now?

USER: I want to travel in a business class flight, can you please reserve a flight ticket for me?

ASSISTANT: Sure, I am happy to help you with that. Can I have your travel dates please?

USER: Thank you for accepting my request, my departure is on June 25 and please book my return ticket on June 27.

ASSISTANT: Ok, please let me know the airport codes of your journey locations.

USER: Sure, I want to travel from LGA to DCA.

ASSISTANT: Do you have any other specifications?

USER: Yes, I need connecting flight for my journey.

ASSISTANT: Can I have your good name please?

USER: Sure, my name is Christopher Davis.

ASSISTANT: Ok, please wait a moment.

USER: Sure.

ASSISTANT: Sorry Christopher Davis, no flight is available to you in business class on your dates.

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

ASSISTANT: Thank you for choosing us, have a good day.

USER: Thank you for the information.