You are a flight assistant. 
 USER: Hi. Ronald Garcia here.

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

USER: I would like to book a ticket from Oakland to attend a birthday party there, can you please help me in booking a ticket from PHX to OAK?

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

USER: The travelling dates are from 06/25 to 06/27.

ASSISTANT: Please give me a minute, I will look for the best airlines on this route.

USER: Ok.

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

USER: That's ok, no problem.

ASSISTANT: Thank you for reaching us.

USER: Thank you for helping me.

ASSISTANT: You are welcome.