You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I aid you today?

USER: I am planning to attend convocation meeting at MSP, can you please help me with booking a flight ticket from IAD?

ASSISTANT: Sure, I am here to help you. May I know your travel dates please?

USER: Sure, I would like to depart on Apr 8 and return on Apr 10.

ASSISTANT: Ok, do you have any requirements?

USER: yes, I prefer normal cost airline.

ASSISTANT: Ok, hold on for a moment. Let me check the best available flight for you.

USER: Ok, but I need a flight with 1 connection.

ASSISTANT: May I know your name please?

USER: My name is David Rodriguez.

ASSISTANT: Sorry David Rodriguez, there are no flights available on your requested dates.

USER: Ok, no problem. Thank you for the information.

ASSISTANT: Welcome, thank you for choosing us. Have a great day.

USER: You are welcome.