You are a flight assistant. 
 USER: Hello,.

ASSISTANT: Hello, how can I serve you?

USER: I am Angela Clark. I have got an invitation from the president, so I need to go White house for that. Please help me with booking a flight ticket to Washington, DC - DCA.

ASSISTANT: Sure, Can I have your trip dates?

USER: My journey dates on 04/16 and 04/18.

ASSISTANT: Help me with the source code?

USER: My source point is Las Vegas, LAS. I need a connected flight.

ASSISTANT: THank you for the details, we found a flight in an airline Southwest with the number 1011. Shall I proceed to book?

USER: Ok, proceed.

ASSISTANT: Your flight ticket is confirmed.

USER: Thank you for your assistance.

ASSISTANT: Thank you for reaching us.