You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I serve you today?

USER: I want to attend music event held in San Francisco, can you help me to book a flight ticket from Washington?

ASSISTANT: Sure, may I know your trip dates?

USER: My trip dates are Mar 9 and Mar 11 respectively.

ASSISTANT: Can you share your specific airport codes please?

USER: Sure, my source airport code is IAD and destination airport code is SFO.

ASSISTANT: Do you need a stopover?

USER: Yes, I need a single stop over in between my journey.

ASSISTANT: May I know your good name please?

USER: Myself Helen Smith.

ASSISTANT: Is there any other requirements to be met?

USER: Yes, I prefer economy class flight.

ASSISTANT: We found a connecting flight 1020 in Delta airlines at the cost of 100 with economy class. Is it ok for you?

USER: Yes, I am fine with this flight. Please proceed.

ASSISTANT: Your booking is done.

USER: Thank you for booking my ticket. I appreciate your help.

ASSISTANT: Thank you for approaching us.