You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: Jacob Robinson here.

ASSISTANT: How can I assist you?

USER:  I am planning to travel from OAK to PHX to attend a convocation party, can you please help me with booking a flight ticket?

ASSISTANT: That's great. Can I know your journey dates?

USER: My required dates are from 07/12 till 07/14.

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

USER: It's ok. Thank you for checking.

ASSISTANT: You are welcome.