You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How can I aid you now?

USER: I want to book a flight ticket from AUS to IAD to meet my grandparents, can you help me with booking?

ASSISTANT: Sure, I am here to help you with that. May I know your travel dates?

USER: My trip dates are Feb 12 to Feb 14.

ASSISTANT: Do you have any connection limit?

USER: I need a connecting flight.

ASSISTANT: May I know your class preference?

USER: I prefer a business class.

ASSISTANT: Do you have any more preferences?

USER: No.

ASSISTANT: Let me know your name to proceed further.

USER: I am Lisa White.

ASSISTANT: Sorry, no flights are found on your routes due to abnormal weather conditions.

USER: No issue, thank you.

ASSISTANT: Thanks for reaching us.