You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I assist you today?

USER: I want to book a ticket for my brother from PHX to DCA airports.

ASSISTANT: Sure, may I know your journey dates?

USER: His travelling dates are 11/21 to 11/23. Make sure that book a ticket on the name of Anthony Harris.

ASSISTANT: We are very sorry to inform you that there is no flights available based on your details. May I know your name?

USER: Anthony Harris. Thank you for you service.

ASSISTANT: Thank you.