You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, may I know your good name please?

USER: My name is Jack Garcia.

ASSISTANT: How are you doing Jack?

USER: I am good. I am planning to attend my college event at PHX from IAD.

ASSISTANT: How can I help you? Ok, may I know your preferable dates?

USER: The travel dates are from 12/17 to 12/19.

ASSISTANT: Sorry, unfortunately there is no flight available for you.

USER: That's ok, thank you for your help.

ASSISTANT: Thank you for approaching us.