You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I assist you?

USER: I want to travel from CA-OAK to MN-MSP, to attend a political meeting at my conference hall which is at St.Paul.

ASSISTANT: Ok, help me with the dates.

USER: My dates of journey is from 01/19 to 01/21.

ASSISTANT: May I know your name?

USER: I'm Jessica Hill here.

ASSISTANT: Sorry, there is no flight available.

USER: No problem.

ASSISTANT: Thank you.

USER: You are welcome.