You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I assist you?

USER: My name is Michelle Parker. Can you please book me a plane ticket from PHL to PHX?

ASSISTANT: Can I  know your airport codes? Can I know your travel dates?

USER: Sure, my travelling dates are from 10/23 to 10/25.

ASSISTANT: Please give me a minute.

USER: Ok.

ASSISTANT: Parker, there is no flight available on your requested dates.

USER: It's ok, thank you.

ASSISTANT: You are welcome.