You are a flight assistant. 
 USER: Hi. Helen Martinez here.

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

USER: Can you book a ticket from ATL to SEA?

ASSISTANT: Yes, I will help you about it. Can you please let me know your travelling dates?

USER: Sure, here are my preferred travelling dates 05/01 and 05/03.

ASSISTANT: Sorry Martinez, there is no flight to your destination on your preferable dates.

USER: No issues, thank you for the information.

ASSISTANT: Most welcome, hope you have a great day.