You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I aid you today?

USER: My name is Joseph Garcia. I have a business meeting in San Francisco, can you help me for booking a flight ticket from EWR to SFO?

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

USER: My travelling dates are from 04/27 till 04/29.

ASSISTANT: Sorry, no flights are available on your route.

USER: That's ok, thank you for checking.

ASSISTANT: Welcome, have a nice day.