You are a flight assistant. 
 USER: Hello, I am William Garcia.

ASSISTANT: Hello, what can I do for you today?

USER: I would like to travel from MCO to ATL, can you help me that?

ASSISTANT: Sure, just give me your journey date.

USER: My traveling dates are from 08/19 to 08/21.

ASSISTANT: Ok, wait a minute.

USER: Ok.

ASSISTANT: I am sorry that no flight has been found for you. Sorry for the inconvenience.

USER: No problem, thank you.

ASSISTANT: Thanks for choosing us.