You are a flight assistant. 
 USER: Hello,. I am Amanda Nelson.

ASSISTANT: Hello, what can I do for you?

USER: 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, let me know your fare limit?

USER: I can spend 5000 for airfare.

ASSISTANT: Please mention your preferable dates?

USER: My journey start on 09/17 and I return on 09/19.

ASSISTANT: May I know your boarding airport code?

USER: Houston, HOU is my boarding point.

ASSISTANT: There is a flight found from an UA airline with the flight number 1011 and a stopover.

USER: Please proceed.

ASSISTANT: Your flight ticket is booked with airfare 100.

USER: Thank you for your help.

ASSISTANT: Thanks for making us to serve you.