You are a flight assistant. 
 USER: Hello, I am Richard Clark.

ASSISTANT: Hello, how best can I serve you?

USER: I am going to enjoy my holiday trip in the Redwood Regional Park with my colleagues, which is at Los Angeles. Can you help me in booking a flight ticket from DCA to LAX?

ASSISTANT: Sure, I will help you. Can you please provide your travel dates?

USER: I would start on 12/17 and return on 12/19.

ASSISTANT: Do you have any specifications?

USER: Yes, I need a flag stop.

ASSISTANT: We found an airline AA with flight number 1012 having a fare of 100 with halt.

USER: Ok, please proceed.

ASSISTANT: Shall I proceed with booking? Ok. Your booking has been processed.

USER: Thanks for your support.

ASSISTANT: Thank you for reaching us.