You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you?

USER: I am Lisa Thomas want to travel from PHX to IAH.

ASSISTANT: May I know your trip dates?

USER: My travel dates are from 10/05 to 10/07.

ASSISTANT: Sorry, there is no flights available.

USER: It's ok, thank you.

ASSISTANT: Most welcome.