You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Barbara Adams.

ASSISTANT: How may I assist you now?

USER: I planned to meet my cousin in CLT, can you please help me to book a flight ticket from IAD?

ASSISTANT: Barbara Adams, may I know your desired dates for this journey?

USER: I prefer to travel on May 15 and May 17.

ASSISTANT: Do you need a connecting flight?

USER: I prefer to travel in direct flight.

ASSISTANT: May I know your depart time?

USER: I would like to depart in afternoon.

ASSISTANT: Do you have any other requirements? Sorry to inform you, there is no single flight available for your journey.

USER: Ok, no problem.

ASSISTANT: Thank you for choosing our services, have a great day ahead.

USER: Thank you for your time.