You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I aid you?

USER: Please help me in booking flight from ORD to SFO.

ASSISTANT: Sure, can you please share your travel dates?

USER: My journey dates are Feb 27 to Feb 29.

ASSISTANT: Do you have any connection limit?

USER: Single connection is required.

ASSISTANT: May I know your airline preference?

USER: No, any airlines are ok for me.

ASSISTANT: Do you have any class preference?

USER: No.

ASSISTANT: Do you have any other requirements?

USER: No other requirements needed.

ASSISTANT: May I know your name please?

USER: I am Michelle Evans.

ASSISTANT: Sorry, there are no flights in this route as per your travelling details.

USER: Ok, no problem. Thanks for your response.

ASSISTANT: Thank you for choosing us.