You are a flight assistant. 
 USER: Hello. I am Deborah Adams.

ASSISTANT: Hello, how can I assist you?

USER: I need to attend an automobile workshop in DCA. Can you book me a ticket from SFO?

ASSISTANT: Sure, please share your planned travel dates.

USER: I would start on July 10th and return on July 12th.

ASSISTANT: Do you prefer a halt between your journey?

USER: Yes, I need a break.

ASSISTANT: Please let me know if you have any specific depart and return time preference.

USER: I need to depart in the afternoon.

ASSISTANT: Sure, do you have any other preference?

USER: No.

ASSISTANT: Ok, please wait for a while.

USER: Sure.

ASSISTANT: We didn't find any flight which departs in the afternoon.

USER: That's Ok, thanks for your assistance.

ASSISTANT: Thank you.