You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How may I guide you? Sure, can I know your preferable dates.

USER: Ok, my dates of journey is from 09/18 to 09/20.

ASSISTANT: May I know your codes?

USER: My respective airports codes are MSP and DTW.

ASSISTANT: May I know your name?

USER: I am Shirley Parker.

ASSISTANT: I am sorry, there are no flights available.

USER: That's ok.

ASSISTANT: Thank you, have a good day.

USER: Thank you.