You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I assist you today?

USER: I would like to travel from SFO to IAD. Can you please help me in this?

ASSISTANT: Sure, may I know your planned travel dates?

USER: My travel dates are from 04/08 to 04/10.

ASSISTANT: Do you have any limits on number of connections?

USER: Only 1.

ASSISTANT: Do you have any another specifications on your journey?

USER: I want to depart from SFO in the afternoon.

ASSISTANT: Sorry, we regret to inform you that there is no flight available on your required dates.

USER: It's ok, thank you.

ASSISTANT: May I know your name for the documentation purpose?

USER: Myself William Brown.

ASSISTANT: Welcome, thank you for reaching us.