You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I guide you?

USER: I am Elizabeth Turner. Please book me a ticket from AZ-PHX to TX-IAH.

ASSISTANT: Can I know your preferable dates?

USER: My preferable travel dates are from 03/30 to 04/01.

ASSISTANT: I am sorry, there are no flights available. Thank you.

USER: Ok, no problem. Thank you.