You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you?

USER: I need to visit Las Vegas, NV - LAS to submit my certificates in my university.

ASSISTANT: Ok. May I know your origin and travelling dates?

USER: I need to travel from TX - DFW on 06/24 and return on 06/26.

ASSISTANT: Ok, let me check what flights are available for you.

USER: Sure.

ASSISTANT: Thanks for your time. We dont have any flights as per your credentials.

USER: Ok, no issue. Thanks for your information.

ASSISTANT: May I know your name?

USER: Sarah Mitchell is my name.

ASSISTANT: Thank you for reaching us.