You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you?

USER: My name is Andrew Williams. I would like to travel from MSP to IAD, could you help me out?

ASSISTANT: Sure, can I know your preferable dates?

USER: My preferable dates are from 03/31 to 04/02.

ASSISTANT: Sorry, no flights available on given schedule.

USER: That's ok. Thank you, have a good day.

ASSISTANT: Thank you for reaching us.