You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How can I help you today?

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

ASSISTANT: Sure, we are gleeful to assist you in booking.

USER: Thank you.

ASSISTANT: Kindly share your boarding and landing airport codes.

USER: DFW and LAS are my airport codes.

ASSISTANT: Do you have any class preference?

USER: I would like to travel in an business class.

ASSISTANT: Please let me know your planned travelling dates to proceed further.

USER: 02/18 and 02/20 are my travelling dates.

ASSISTANT: Ok, please wait a moment.

USER: Ok.

ASSISTANT: Thank you for waiting, we are unable to provide flight in between your journey routes due to some technical up-gradation at destination airport.

USER: No issue. Thank you.

ASSISTANT: May I know your name please?

USER: Myself Scott White.

ASSISTANT: Thank you for approaching us.