You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How can I assist you today?

USER: Can you please help me in booking a flight ticket to SFO from JFK?

ASSISTANT: Sure, I will help you. Can you please share me your travelling dates?

USER: My travel dates are from Apr 14 to Apr 16.

ASSISTANT: Ok, please share me your name.

USER: I am George Martin.

ASSISTANT: Ok, do you have any connection limit?

USER: I need a connecting flight.

ASSISTANT: Ok, do you have any other specifications?

USER: I would like to depart in the evening.

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

USER: Ok, no problem. Thank you.

ASSISTANT: Welcome, have a nice day.