You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I help you?

USER: I'd like to know whether there are any flights from SEA to ATL.Can you help me out?

ASSISTANT: Please provide your name for further proceedings.

USER: Sure, my name is Gregory Hill.

ASSISTANT: Please provide your travelling dates.

USER: Sure, check for flights on dates 05/21 and 05/23.

ASSISTANT:  Sorry, there is no flight available at your request. Thank you for contacting us.

USER: OK, thank you.

ASSISTANT: You're welcome.