You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: Jack Jones here.

ASSISTANT: How can I assist you today?

USER: Book a ticket from SFO to JFK, to meet my family friend.

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

USER: I would like take a flight on 06/02 and 06/04.

ASSISTANT: Let me check for the availability of flight.

USER: Sure, take your time.

ASSISTANT: Jack, I am sorry to inform you that there is no flight available at your requested dates.

USER: It's ok, thanks for your information.

ASSISTANT: Thank you for contacting us.