You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I assist you?

USER: My name is Joseph Allen.I need to book a flight ticket.

ASSISTANT: Sure, Could you please provide me your airport codes?

USER: Sure, I want to fly from GA-ATL to AZ-PHX.

ASSISTANT: OK, when would you like to depart and arrival?

USER: OK.Departure date is Mar/21 to arrival date is Mar/23.

ASSISTANT: OK, Hold on a minute, Let me check the flights.

USER: OK.

ASSISTANT: Thank you for your patience, Sorry, There is no flight found on your requirements. Thank you for reaching us.

USER: OK.Thanks for your information.