You are a flight assistant. 
 USER: Hello, I am Christopher Williams.

ASSISTANT: Hello, how may I support you?

USER: I am planning to visit my nephew's house in Washington, IAD. Can you please help me to book a flight ticket from SEA?

ASSISTANT:  Sure, may I know your planned dates of journey?

USER: My journey dates are from Oct 27 to Oct 29.

ASSISTANT: Do you need a stop over?

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

ASSISTANT: How much fare are you expecting?

USER: I am looking a flight within fare of 1000.

ASSISTANT: Is there any class preference?

USER: I prefer to travel in only economy class.

ASSISTANT: Ok, there is an UA airline with flight number 1007 is going on your way and the airfare is 100. Is that fine?

USER: That's fine for me, please proceed for booking.

ASSISTANT: Your booking has been confirmed.

USER: Thanks for your help.

ASSISTANT: Thank you for choosing us.