You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Christopher Nelson.

ASSISTANT: How can I assist you at this moment?

USER: I planned to attend for a wedding in HOU, can you please help me to book a flight ticket from AUS?

ASSISTANT: Sure, I will help you with this. Can you please provide your travel dates to proceed further?

USER: I prefer to travel on 11/19 and 11/21.

ASSISTANT: Wait a moment please.

USER: Sure.

ASSISTANT: Christopher Nelson, there are no flight services available on this route on your provided dates.

USER: Ok, no problem.

ASSISTANT: Thank you for contacting us.

USER: Thank you for your time.