You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I help you today?

USER: I am planning to attend music concert at MCO, can you please help me with booking a flight ticket from IAD?

ASSISTANT: Sure, I am gleeful to help you with that. May I know your planned journey dates?

USER: I would like to take off on June 20 and return on June 22.

ASSISTANT: Would you like to board a direct or connecting flight?

USER: I am looking for a connecting flight.

ASSISTANT: Do you have any class preference?

USER: I am comfortable with any class preference, but I would like to depart during evening time.

ASSISTANT: Is there any other requirements regarding your journey?

USER: I don't have any other requirement.

ASSISTANT: Sorry to say that, there are no flights found on this route as per your travel dates.

USER: Ok, no issues. Thank you for checking.

ASSISTANT: May I know your name for documentation purpose?

USER: My name is Kevin Green.

ASSISTANT: Thank you for reaching us, have a great day.

USER: You are welcome.