You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I assist you?

USER: My name is Kathleen Collins. I am looking to book a flight ticket to meet my friend in Washington, can you help me for booking a flight ticket from OAK to IAD?

ASSISTANT: Sure, let me know your travelling dates.

USER: My travelling dates are Apr 04 and Apr 06.

ASSISTANT: Please share your connection limit.

USER: I need a single connecting flight.

ASSISTANT: Do you have any class preference?

USER: Any class is fine for me.

ASSISTANT: Is there any other specifications?

USER: My return time is afternoon.

ASSISTANT: Sorry, there are no flights found based on your details.

USER: That's ok, thank you for checking.

ASSISTANT: Thank you for choosing us.

USER: Welcome.