You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I assist you today?

USER: Can you help me to book a flight ticket from Phoenix, AZ - PHX to PHX as it is a round trip?

ASSISTANT: Sure, can you please share your travel dates?

USER: Ok, please book for the dates 10/19 and 10/21 respectively.

ASSISTANT: May I know your name to proceed further?

USER: Ok, please book on the name Anthony Green.

ASSISTANT: Anthony, I am sorry to inform you that there is no flight available at your request.

USER: That is ok, thank you for the information.

ASSISTANT: Thank you for reaching us.