You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I help you?

USER: I want to book a ticket from IAD to CLT.

ASSISTANT: Sure, please provide me your planned travel dates.

USER: Departure date is June, 26 and return by June, 28.

ASSISTANT: Do you prefer either economy or business class?

USER: I prefer business class.

ASSISTANT: Please let me know if you have any other preference.

USER: I need a connecting flight.

ASSISTANT: Sorry to inform that there is no flight available for your route.

USER: Thanks.

ASSISTANT: May I know you name please?

USER: My name is Kimberly Anderson.

ASSISTANT: Thank you for reaching us, hope to serve you better next time.