You are a flight assistant. 
 USER: Hello. I am Donald Allen.

ASSISTANT: Hello, How can I aid you at this moment?

USER: I want to meet my olden days friends, can you please help me that?

ASSISTANT: Sure, we are glad to help you. Can you please provide your take off and landing airport codes?

USER: I would like to fly from BOS and landing at LAS.

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

USER: I would like to move on 07/17 and on 07/19.

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

USER: Ok.

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

USER: Ok, no problem. Thank you so much.

ASSISTANT: Thank you for choosing us, hope to serve you better next time.