You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you?

USER: Please assist me to book a flight ticket from BOS to SFO to meet my family members.

ASSISTANT: Please provide me with the travel dates.

USER: I have planned to travel on Jan 12th and return on Jan 14th.

ASSISTANT: Is there any class preference?

USER: I am ok with any class but I want to return at afternoon time.

ASSISTANT: May I know if you have any connection limit?

USER: I like direct flight.

ASSISTANT: Are there any more preferences that you want to avail?

USER: No, thanks.

ASSISTANT: May I know your name please?

USER: Myself Rachel Moore.

ASSISTANT: Give me a moment.

USER: Ok.

ASSISTANT: Rachel Moore. I regret to inform that there are no flights on your route with the given dates.

USER: Ok, no problem. Thank you.

ASSISTANT: Thank you for reaching us.