You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I help you?

USER: I would like to spend my free time at Phoenix, please help me in booking a ticket from HOU to PHX.

ASSISTANT: That's nice, please provide your trip dates to get a flight for you.

USER: Ok, my travelling dates are from 05/28 to 05/30.

ASSISTANT: May I know your name in the meanwhile?

USER: My name is Donald Turner.

ASSISTANT: Sorry to inform you, there is no flight found on your route to book your ticket.

USER: Ok, no problem. Thank you for your response.

ASSISTANT: Welcome Donald Turner.