You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I aid you?

USER: I am Charles Jones. Can you please help me in booking a flight ticket from SFO to IAD?

ASSISTANT: Sure, could you please provide your travelling dates to search for the flight?

USER: My travelling dates are Feb 7th and Feb 9th.

ASSISTANT: Do you have any particular time for departing and returning?

USER: The depart time should be afternoon.

ASSISTANT: Do you have any requirements?

USER: I need a connecting flight.

ASSISTANT: Sorry, no flight is available for you.

USER: Ok, not an issue.

ASSISTANT: Thank you for reaching us.

USER: Thank you.