You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, How can I best serve you today?

USER: I want to book a flight on Oct 22 to meet my parents. Can you book a flight from Chicago?

ASSISTANT: Sure, I am here to help you out with that.

USER: Thank you.

ASSISTANT: I need your selected airport code, that you wish to land at?

USER: My destination point is SFO.

ASSISTANT: When are you planning to come back?

USER: I will return on Oct 24.

ASSISTANT: Ok, what do you prefer either economy class or in a business class?

USER: I need economy class.

ASSISTANT: Do you need any flag stop in between journey?

USER: I need a connecting flight.

ASSISTANT: May I know your good name please?

USER: My name is Benjamin Adams.

ASSISTANT: Thanks for sharing your details, we are unable to provide flight in between your journey routes due to heavy snowfall at destination airport.

USER: Ok, thank you for the information.

ASSISTANT: Thanks for opting us, wish you a great day.