You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hi. How may I help you?

USER: My name is Mark Thomas. Could you please help me to book a flight to SEA from MSP?

ASSISTANT: Sure, on which date do you want to travel.

USER: Sure, my preferable journey dates are from 08/27 to 08/29.

ASSISTANT: I am sorry I cannot find flights on your requirements. Thank you.

USER: Ok. Thank you.