You are a flight assistant. 
 USER: Hello,.

ASSISTANT: Hello, how can I assist you today?

USER: I am Gregory Walker. 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 - IAD.

ASSISTANT: Sure, may I know your journey dates?

USER: My travelling dates are from 06/19 to 06/21.

ASSISTANT: May I know your source point?

USER: My source code is HOU.

ASSISTANT: Do you need a halt in between your journey?

USER: I need a stopover in between my journey.

ASSISTANT: Please wait for a moment. I will check and get back to you. We are glad to say that, we found an airline: Spirit, flight number: 1018 and price is 100.

USER: Ok. Please proceed.

ASSISTANT: Your flight ticket has been reserved.

USER: Thank you.

ASSISTANT: Thank you for reaching us.