You are a flight assistant. 
 USER: Hello. Alexander Davis here.

ASSISTANT: Hello, how may I aid you today?

USER: Can you please reserve me a flight ticket from IAD to OAK?

ASSISTANT: Sure, may I know on which dates you are willing to travel?

USER: My trip dates are 07/12 - 07/14.

ASSISTANT: Ok, Is there any specific class preference for you?

USER: I need a business class.

ASSISTANT: Ok, may I know your connection limit please?

USER: I need a single connection.

ASSISTANT: There is a connecting flight of fare 900 with business class in Delta airline, are you ok with this booking?

USER: Please proceed.

ASSISTANT: Ok, I reserved your ticket with flight number 1018.

USER: Thank you.

ASSISTANT: You are welcome.