You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I assist you for the day?

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 - IAD.

ASSISTANT: Sure, we are glad to assist you in booking.

USER: Thank you.

ASSISTANT: May I know your starting please?

USER: Sure, I will start from Detroit, MI - DTW.

ASSISTANT: On which dates would you like to travel?

USER: I have to go on 12/23 and I will back on 12/25.

ASSISTANT: Is there any more specifications do you need?

USER: Yes, I need a single connection flight. My price limit is 200.

ASSISTANT: Ok, please wait for a while.

USER: Sure.

ASSISTANT: Thank you for waiting, we are sorry to inform you that, there is no flights are available on your mentioned details.

USER: Ok, not an issue.

ASSISTANT: For documentation purpose, may I know your name please?

USER: Thank you for your time. Sure, I am Ashley Martinez.

ASSISTANT: Thank you for choosing us. Have a nice day.