You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I assist you at this moment?

USER: I am Anna Hall. I would like to meet my client at Oakland, can you please help me to book my flight ticket from DCA to OAK?

ASSISTANT: Sure, I will assist you in booking flight ticket. Could you please mention your preferable travel dates?

USER: Sure, I will start my journey on Sept 4th and I will return back on Sept 6th.

ASSISTANT: Is there any additional preferences do you have?

USER: Yes, I prefer for a single connection flight for my journey.

ASSISTANT: Ok, please hold on a moment, I will check flight availability in this route.

USER: Sure.

ASSISTANT: UA airline flight available with connection limit 1 and fare is 100, shall I confirm this economy class flight ticket?

USER: Yes, please book the ticket for me.

ASSISTANT: Your flight ticket is booked successfully, flight number is 1001.

USER: Thank you so much for your help.

ASSISTANT: You are welcome Anna Hall.