You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: Ruth Taylor here.

ASSISTANT: How can I assist you today?

USER: As my wedding date which has been postponed to some other date in Boston. So can you change my flight ticket reservation?

ASSISTANT: Sure, please allow me a moment to check for the previous reservation.

USER: Ok.

ASSISTANT: I found your reservation. Can you please help me with the airport codes?

USER: The airport codes are from LAS to BOS.

ASSISTANT: Could you please share your travel dates?

USER: My travel dates are from June 23 to June 25.

ASSISTANT: May I know your connection limit?

USER: I would like to prefer a single connecting flight.

ASSISTANT: Do you have any class preference?

USER: I am looking for a business class.

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

USER: No, that is it.

ASSISTANT: Ruth Taylor, I am sorry to inform you that there is no flight available at your request.

USER: Not a problem. Thank you.

ASSISTANT: Thank you for reaching us.