You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How may I guide you?

USER: I am Frank Hill.

ASSISTANT: Can I know the details of travel?

USER: I just want to book a ticket from MA-MSP to DC-IAD. My travel dates are from 08/23 to 08/25.

ASSISTANT: Do you have any additional requirements?

USER: Make sure that connection limit is 1 and price limit is 1000.

ASSISTANT: I'm sorry Frank, there are no flights matching your requirements. Thank you, have a good day.

USER: Ok. Thank you.