You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How may I help you?

USER: I need to book a ticket from OAK to AUS. Could you book a ticket?

ASSISTANT: Sure, I will help you with that. Can I have your travel dates please?

USER: Departure is on Feb, 10 and return date is Feb, 12.

ASSISTANT: Do you like to go with a economy class or business class?

USER: I would like to prefer economy class.

ASSISTANT: Do you have any other requirements that you are looking for?

USER: I would prefer direct flight.

ASSISTANT: Ok, please share your name to proceed further.

USER: My name is Edward Gonzalez.

ASSISTANT: Sorry, no flight is available for you as per your requests.

USER: Thank you.

ASSISTANT: Welcome Edward Gonzalez.