You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Christopher Williams.

ASSISTANT: Christopher Williams, how may I assist you today?

USER: Please book me a ticket from SFO to JFK to meet my family.

ASSISTANT: Sure, I will help you. Please help me with your planned travel dates.

USER: I have planned to travel on Jan 11th and return on Jan 13th.

ASSISTANT: Please help me with your preferred depart and return time.

USER: I would like to return at evening time.

ASSISTANT: Do you need a direct or connecting flight?

USER: I prefer connecting flight.

ASSISTANT: Do you have any other preferences in your journey?

USER: No.

ASSISTANT: Christopher Williams, I am sorry to inform you that there are no active flights operated in your journey.

USER: Ok, no problem. Thank you.

ASSISTANT: Thank you for reaching us. Have a great time.