You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I oblige you today?

USER: Christine Edwards here. I'm planning to visit Boston, can you please book a ticket from OAK to BOS?

ASSISTANT: Sure, kindly assign your preferred dates of travelling.

USER: Sure, my planned departure and return travel dates are 2nd and 4th of August.

ASSISTANT: Do you have any other requirements?

USER: Yes, I need a business class ticket.

ASSISTANT: Do you need a break in between your journey?

USER: Yes, even I'm ok with direct flight also.

ASSISTANT: Ok, please wait. let me check the flight details and get back to you.

USER: Sure, take your own time.

ASSISTANT: We found an economy class ticket in JetBlue airline, are you comfortable with it?

USER: No, I want business class ticket only. Search for it.

ASSISTANT: Sorry, there were no flights found with business class ticket.

USER: That's ok, thank you for your service.

ASSISTANT: Thank you for choosing us.