You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Donna Wilson.

ASSISTANT: How can I assist you at this moment?

USER: I need to attend a conference at LAS can you help me booking a flight ticket from IAH?

ASSISTANT: Sure Donna Wilson, I will help you with that.

USER: Thank you.

ASSISTANT: Can I have your travel dates please?

USER: I will start on 07/06 and return on 07/08.

ASSISTANT: Ok, please wait a moment to check flight availability.

USER: Sure.

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

USER: No problem. Thank you for the information.

ASSISTANT: Thank you for choosing us, have a good day.