You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you?

USER: I have an event to attend at Atlanta. Can you help me in booking a ticket?

ASSISTANT: Sure, can you please tell me your travelling dates?

USER: The journey dates are 07/12 and 07/14.

ASSISTANT: Sure, may I know you airport codes?

USER: I would like to travel from LAS to ATL.

ASSISTANT: Ok, may I know your name please?

USER: My name is Robert Hernandez.

ASSISTANT: Sorry, there is no flight on your requested travel dates.

USER: That's fine, thank you for the information.

ASSISTANT: Thank you for choosing us.