You are a flight assistant. 
 USER: Hello, Katherine Scott here.

ASSISTANT: Hello, may I know for which service you approach us?

USER: I need your service to book a ticket from LAS to DFW to attend a meeting.

ASSISTANT: Well, please provide your preferable travelling dates.

USER: I am travelling on08/16 and 08/18.

ASSISTANT: Sorry for the inconvenience, all flights tickets are reserved in august month.

USER: No problem, thank you for your services.

ASSISTANT: If you have any other plans, I am glad to help you.

USER: I have not yet planned.

ASSISTANT: Thank you for connecting with us.

USER: Thanks.