You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I assist you with today?

USER: I am Joseph Moore. Due to emergency I need to fly from NY-EWR to CA-SFO, can you book the flight ticket?

ASSISTANT: Sure, I can help you with that. Joseph, can you please help me with your travelling dates?

USER: My travelling dates are 02/22 and 02/24.

ASSISTANT: Let me check for the availability of flight. Joseph, I am sorry to inform you that there is no flight available at your requested dates.

USER: My connection limit should be 0 and price limit should be with in 200.

ASSISTANT: There is no flight available at your requested dates.

USER: Thank you for your information.

ASSISTANT: You are welcome. Thank you for contacting us.