You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you?

USER: I am Robert Thomas.

ASSISTANT: Ok.

USER: I want to attend my niece wedding at Washington, DCA. Can you help me in booking a flight ticket under the range of 200?

ASSISTANT: Sure, may I know your source airport?

USER: I am boarding at Detroit, DTW.

ASSISTANT: Please provide me your planned journey dates.

USER: My planned dates are from 04/23 to 04/25.

ASSISTANT: Let me know your connection limit.

USER: I need 1 connection.

ASSISTANT: Ok, please wait for a moment.

USER: Sure.

ASSISTANT: Sorry, no flights found with your given details.

USER: Ok, no problem. Thank you.

ASSISTANT: Thank you for choosing us.