You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I support you today?

USER: My name is Richard Jackson. I want to book a flight ticket on 04/29 to attend a Music festival in Washington.

ASSISTANT: Ok, May I know your return date?

USER: My return day is 05/01.

ASSISTANT: Ok, please provide your source and destination airport codes.

USER: My source and destination airport codes are MI - DTW, DC - IAD.

ASSISTANT: Ok, Do you need any halt in between your journey?

USER: I want direct flight.

ASSISTANT: Ok, please wait for a while.

USER: Sure.

ASSISTANT: Thank you for being patient, No flights were found with your given details.

USER: No problem, thank you for your service.

ASSISTANT: Thank you for choosing us.