You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: Elizabeth Green here.

ASSISTANT: How can I aid you?

USER: I am a salsa dancer, I have to take part in a contest at Phoenix. Could you book my ticket from OAK to PHX?

ASSISTANT: Sure, may I know your travelling dates?

USER: My trip dates are 03/21 and 03/23.

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

USER: It's ok, thank you.

ASSISTANT: Thank you for reaching us.