You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I assist you today?

USER: I am Larry Rodriguez. Can you book a flight from EWR to SFO?

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

USER: Ok, my travel dates are 04/22 and 04/24 respectively.

ASSISTANT: Let me check for the availability of flight. Larry, there is no flight available at your requested dates.

USER: Ok, no problem.

ASSISTANT: Thank you for contacting us.