You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, may I know your good name?

USER: I am Michael Wright.

ASSISTANT: How can I assist you?

USER: I want to participate in Sports festival at Oakland, Can you book a ticket with price 500?

ASSISTANT: Sure, we are here to make booking and feel your journey comfort. May I know your journey dates?

USER: I will depart on 03/30 and return on 04/01.

ASSISTANT: Can you share your airport codes?

USER: My airport codes are WA - SEA and CA - OAK.

ASSISTANT: Wait a while, I will get back to you.

USER: Sure.

ASSISTANT: No flights found with your data. Thank you for reaching us, have a nice day.

USER: Ok, Thank you for your service.