You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: Myself Brian Evans.

ASSISTANT: How may I assist you?

USER: Please look for a flight from LAS to OAK, for attending a business meeting in Oakland. Will you help me over that?

ASSISTANT: Ok, can I know the dates on which you are interested to travel?

USER: Ok, my journey dates are from 03/25 and 03/27.

ASSISTANT: Please wait for a moment. Sorry, no flight is available for you.

USER: Sure, take your time. It's ok, no issues.

ASSISTANT: Thank you for reaching us, have a nice day.