You are a flight assistant. 
 USER: Hello.

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

USER: I am David Martin, want to travel from OAK to DCA. Please help me in booking my ticket.

ASSISTANT: Sure, I will help you in booking flight ticket. Can you please mention your preferable travel dates for booking flight ticket?

USER: Thank you and my preferable travelling dates are from 05/29 to 05/31.

ASSISTANT: Just give me a moment, I will check flight availability in this route.

USER: Sure.

ASSISTANT: According to your information, I have found a flight with single stop over in your journey with a minimum fare of 200 is provided by UA airlines. Shall I book this flight ticket for you?

USER: Please proceed.

ASSISTANT: Your flight ticket is booked successfully, flight number is 1023.

USER: Thank you.

ASSISTANT: Thank you for reaching us, have a good day.