You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello,may I know your name please?

USER: Richard Thompson here, want to a book from Seattle SEA.

ASSISTANT: OK,please let me know your destination?

USER: It's Phoenix. I like to travel on 05/05. Please make sure if flight is there on 05/05.

ASSISTANT: Please can you tell me when you want to return from your vacation?

USER: On 05/07.

ASSISTANT: OK,can I know your destination airport code?

USER: My destination code is PHX.

ASSISTANT: OK,I am sorry there is no flight available on your provided information.

USER: Oh! it's OK. Thank you for your time.