You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I guide you for today?

USER: I was looking for a flight on the route from ATL to SFO, can you help me?

ASSISTANT: Can you please share on what dates you are willing to travel?

USER: 11/21 to 11/23 will be my travelling dates.

ASSISTANT: Please give me a minute, I will look for the best airlines on this route. May I know your name?

USER: Sure. Myself David Perez.

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

USER: Oh! That's sad. Anyways, thank you for checking.

ASSISTANT: Thank you for availing us.

USER: You are most welcome.