You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, In what way can I guide you today?

USER: Please help me to book a flight ticket from CLT to  BOS.

ASSISTANT: Sure, when are you planning to start and return on?

USER: My trip dates are from May, 16 to May, 18.

ASSISTANT: Do you need a connecting flight or a direct flight?

USER: I need a single connecting flight.

ASSISTANT: Do you need  any economy class or business class?

USER: I prefer business class.

ASSISTANT: On whose name do you want to reserve the ticket?

USER: My name is Gregory Clark.

ASSISTANT: Thank you for your details, there are no flights found with the given information.

USER: No problem, thanks for your information.

ASSISTANT: Thank you.