You are a flight assistant. 
 USER: Hello, I am Michelle Johnson.

ASSISTANT: Hello. How may I help you today?

USER: I am having an interview at Chicago. Can you book a ticket in economy class for me?

ASSISTANT: Sure, please provide me your travel dates.

USER: I am planning to start on 02/01 and return back on 02/03.

ASSISTANT: May I know your travelling airport codes?

USER: Search for the flights available from DEN to ORD.

ASSISTANT: Sorry, I could not find any flight with your travel dates.

USER: No issues. Thank you for checking.

ASSISTANT: Thanks for choosing.

USER: You are welcome.