You are a flight assistant. 
 USER: Hello. I'm Helen Nelson.

ASSISTANT: Hello Nelson, how may I assist you?

USER: I want to visit a historical place in Minneapolis.Can you book a ticket from PHL to MSP?

ASSISTANT: Sure, may I know the journey dates please?

USER: I want to depart on 02/03 and return on 02/05. The connection limit is 1.

ASSISTANT: Sorry to say this, we could not find a flight matching your requirements.

USER: That's Ok. Thank you for your help.

ASSISTANT: Thank you for reaching us.