You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I assist you?

USER: Nicholas Evans here. I want to travel from ORD to SFO for attending a Seminar. Can you please help me for booking the flight ticket?

ASSISTANT: Sure, let me know your travel dates please?

USER: My travelling dates are from 07/26 to 07/28. Make sure my price limit is 500.

ASSISTANT: Sure, I will ensure that.

USER: Thanks.

ASSISTANT: I am sorry to inform you that presently there is only zero connection flight available.

USER: Make sure my connections limit is 1.

ASSISTANT: There is no single connection flight.

USER: Anyway, thanks for the information.

ASSISTANT: Thank you.