You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I assist you at this moment?

USER: I want to book a ticket from Oakland, OAK to Los Angeles, LAX, can you please help me?

ASSISTANT: Sure, I will help you with this. Could you please provide your journey dates?

USER: My travelling dates are on Nov 30 and return date is on Dec 2.

ASSISTANT: Do you have any class preference?

USER: I need a economy class.

ASSISTANT: May I know your good name for documentation purpose?

USER: My name is Helen Young.

ASSISTANT: Helen Young, there are no flight services available on this route on your provided dates.

USER: Ok, no problem. Thank you.

ASSISTANT: Thank you for contacting us.