You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I assist you today?

USER: I would like to celebrate my birthday at Oakland, please help me in booking a ticket from SEA to OAK.

ASSISTANT: Sure, can I know your travelling dates please?

USER: My planned travel dates are on June 05 and June 07.

ASSISTANT: Please provide your specifications.

USER: I prefer business class for my trip.

ASSISTANT: May I have your good name please?

USER: My name is Amanda Adams.

ASSISTANT: Unfortunately we did not find any flight on your matching details.

USER: I prefer normal-cost airline, please check the availability of flights.

ASSISTANT: Please give me a moment.

USER: Sure.

ASSISTANT: Sorry there are no flights available on your route.

USER: Ok, no problem. Thank you for your information.

ASSISTANT: Thank you.