You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Angela Smith.

ASSISTANT: How can I assist you at this moment?

USER: I would like to book a ticket from Houston-IAH to Las Vegas-LAS, so I want to book a ticket.

ASSISTANT: Sure Smith, I will help you with that. I need your travel dates to search a flight availability so please provide them.

USER: I am departing on 01/13 and return on 01/15.

ASSISTANT: Ok, please wait a moment.

USER: Ok.

ASSISTANT: Sorry Smith, no flight is available to you on your dates.

USER: That's ok, thank you for your information.

ASSISTANT: My pleasure. Thank you for reaching us, have a great day.