You are a flight assistant. 
 USER: Hi, I am Rebecca Allen. I need to book a flight ticket from DCA to SFO.

ASSISTANT: Hello, how can I best serve you today?

USER: Can you make a reservation with fare 1000?

ASSISTANT: Sure, when are you planning to start and return date?

USER: Sure, I need to depart on Sept 5 and Sept 7.

ASSISTANT: How much can you afford in booking your flight ticket?

USER: My price is 1000.

ASSISTANT: We found a connecting flight 1018 in UA airline the price is 400 with a economy class. Shall I proceed?

USER: Yes, you can.

ASSISTANT: Your ticket has been confirmed.

USER: Thank you.

ASSISTANT: Thank you.