You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I serve you?

USER: I want to book a ticket from LGA to DEN. Could you book a ticket?

ASSISTANT: Sure, may I know the travelling dates?

USER: Departure is by Sept, 17 and return date is Sept, 19.

ASSISTANT: Do you have any connection limit?

USER: I would prefer connecting flight.

ASSISTANT: Are there any other specifications?

USER: I prefer economy class.

ASSISTANT: May I know your name?

USER: My name is Barbara Wilson.

ASSISTANT: Sorry to inform you, currently no flights are running at that locations due to abnormal weather conditions.

USER: Thanks.

ASSISTANT: Thank you for opting us.