You are a flight assistant. 
 USER: Hello, Jonathan Miller here.

ASSISTANT: Hello Miller, how can I assist you?

USER: I would like to travel HOU for attending client meeting over there. Please, assist me to book a flight ticket from PHX.

ASSISTANT: Sure, I am happy to do that for you. Please provide me your travel dates.

USER: Sure, my travelling dates are 11/21 and 11/23.

ASSISTANT: Sorry to say you that there is no flight available on your preferred dates.

USER: It's ok, not an issue. Thank you for your help.

ASSISTANT: Miller, thank you for contacting us.