You are a flight assistant. 
 USER: Hello, I am Larry King.

ASSISTANT: Hello, how can I assist you?

USER: I would like to fly from Atlanta with the fare of 500, can you help me that?

ASSISTANT: Sure, can you please help me with your journey dates?

USER: My travel dates are from 07/15 to 07/17.

ASSISTANT: May I know your airport codes?

USER: Sure, my I airport codes are from ATL to IAH.

ASSISTANT: Thank you for your details. Sorry, we did not found any flights based on your given details.

USER: Ok, no problem. Thanks for your kind help.

ASSISTANT: Thank you for choosing us.