You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I serve you today?

USER: I am planning to visit Oakland, can you please book me a ticket from PHX to OAK?

ASSISTANT: Sure, please share me your trip dates.

USER: My preferable journey dates are Oct 08 and Oct 10.

ASSISTANT: Do you need any specifications?

USER: I prefer business class.

ASSISTANT: May I know your airline preferences?

USER: I am comfort with any airlines.

ASSISTANT: For booking, we need your good name. Please mention it.

USER: My name is Charles Robinson.

ASSISTANT: Please wait for a while.

USER: Sure, I would like to return in morning flight.

ASSISTANT:  Sorry to say that, there are no flights available on the routes of your journey.

USER: Ok, not an issue. Thank you for providing information.

ASSISTANT: Thank you for opting us.