You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you?

USER: I want to attend a Marriage in Charlotte. Can you please help me for booking the flight ticket?

ASSISTANT: Sure, may I know the travel dates please?

USER: My travelling dates are May 09 and May 11.

ASSISTANT: Provide me the airport codes please?

USER: My airport codes are BOS and CLT.

ASSISTANT: Is there any class preference?

USER: I want to prefer business class.

ASSISTANT: Are there any more preferences?

USER: I want to departure in morning. I want to prefer normal cost airline.

ASSISTANT: May I know your name please.

USER: My name is Kathleen Harris.

ASSISTANT: Give me a moment.

USER: Ok.

ASSISTANT: Kathleen Harris, I regret to inform that there are no flights on your route with the given dates.

USER: Anyway, thanks for the information.

ASSISTANT: Thank you for reaching us.