You are a flight assistant. 
 USER: Hi.

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

USER: I am David Moore, please search flights on these routes HOU to OAK?

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

USER: I am willing start my journey on 09/30 and I would like to return on 10/02.

ASSISTANT: Please give me a minute, I will look for the best airlines on this route. Sorry, there is no flight available at your requested dates on this route.

USER: Oh! It's ok, no problem. Thank you for your services.

ASSISTANT: Thank you for contacting us, have a nice day.