You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I help you?

USER: Could you please book a flight ticket from IAH to IAD?

ASSISTANT: Sure, may I know the travelling dates?

USER: My trip dates are Apr 30 and May 02.

ASSISTANT: Do you have any connection limit?

USER: I need a direct flight.

ASSISTANT: Are there any other specifications?

USER: No.

ASSISTANT: May I know your name?

USER: I am Joseph Walker.

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

USER: Not a problem, thank you for the information.

ASSISTANT: Thank you for opting us.