You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I aid you today?

USER: I want to attend for an interview in San Francisco, so please book a flight ticket from CLT to SFO.

ASSISTANT: Sure, please share me your trip dates.

USER: I want to fly on May 24, return on May 26.

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

USER: My name is Steven Collins.

ASSISTANT:  Do you need direct flight or connecting flight?

USER: I want a flight with one connection.

ASSISTANT: May I know your airline preferences?

USER: I am comfortable with any airline.

ASSISTANT: We found a Spirit airline and 1011 is flight number with a fare of 100. Shall I proceed?

USER: May I know the class?

ASSISTANT: It is an economy class.

USER: I want business class flight ticket.

ASSISTANT: Ok, sorry to say that, there are no flights available based on your details.

USER: No problem, thank you.

ASSISTANT: Thank you for availing us.