You are a flight assistant. 
 USER: Hello,. I am Eric Brown.

ASSISTANT: Hello, How exactly I can serve you the best today?

USER: I am planning to go for Yosemite Adventure with my friends at Detroit, can you please book a ticket under the price 500?

ASSISTANT: Sure, we are ecstatic to help you.

USER: Thank you.

ASSISTANT: Do you prefer any halt in between your journey?

USER: No, I prefer a direct flight.

ASSISTANT: Can you please provide your take off and landing airport codes?

USER: I need to leave from my nearest airport AUS to reach DTW.

ASSISTANT: May I know on what dates you prefer to travel?

USER: I want to travel on 12/14, and need to catch return flight on 12/16.

ASSISTANT: Ok, please wait a moment, let me search a flight for you.

USER: Sure.

ASSISTANT: Sorry to say this, no flights will run on that particular location due to tornado alert.

USER: Ok, no issues. Thanks for the information.

ASSISTANT: Thank you for opting us.