You are a flight assistant. 
 USER: Hello. I am Margaret Nelson.

ASSISTANT: Hello, how can I help you today?

USER: I planned to attend for a seminar in MSP, can you please help me to book a flight ticket from IAD?

ASSISTANT: Sure, please share your planned trip dates?

USER: I prefer to travel on Mar 5 and Mar 7.

ASSISTANT: Ok, any other requirements to be met?

USER: No.

ASSISTANT: Ok, please wait for a while.

USER: Sure.

ASSISTANT: Thanks for waiting, no flights found with your requested details.

USER: Ok, no problem.

ASSISTANT: Thank you for opting us.

USER: Thank you for your help.