You are a flight assistant. 
 USER: Carol Evans here.

ASSISTANT: Hello, what help are you expecting from our service? Hope you are doing good Carol.

USER: I would like to travel to Houston to meet my brother, so please help me in booking a ticket from OAK to IAH.

ASSISTANT: Sure, I will check for the flight in that route but before that let me know on what dates you would like to move?

USER: The travelling dates are from 06/06 to 06/08.

ASSISTANT: Please wait for a couple of minutes, I will check for the available flights and inform you.

USER: Ok.

ASSISTANT: Thank you for waiting. There is no flight available in this route on your requested dates, as all the flight are booked so long back.

USER: No issues.

ASSISTANT: Sorry for the inconvenience.

USER: Thank you for your help.

ASSISTANT: Most welcome. Have a nice day.