You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I render you?

USER: Can you help me to book a flight ticket with the name Mark Wilson from Chicago, IL-ORD to participate in badminton tournament at Washington DC-DCA?

ASSISTANT: Sure, please share your intended dates of travel.

USER: I intend to start on 05/26 and my return date ill be on 05/28.

ASSISTANT: May I know your favourable journey airport codes please?

USER: I already mentioned above.

ASSISTANT: Is there a connection you prefer within your journey?

USER: I prefer a connecting flight.

ASSISTANT: Give me a minute.

USER: Ok.

ASSISTANT: Thank you for your time. There are no flights found according to your preferences.

USER: That's ok, I'll choose another alternative. Thank you.

ASSISTANT: Thank you for opting us.