You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I amend you?

USER: I am Paul Edwards. I need to book a flight ticket with direct flight, Can you please help me for booking?

ASSISTANT: Sure, can I have your trip dates?

USER: I would like to travel on 11/20 to 11/22.

ASSISTANT: Help me with the airport abbreviates?

USER: My take off IAD to DTW.

ASSISTANT: Thank you for the details, please be on hold.

USER: Sure.

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

USER: Ok, no problem. Thanks for your information.

ASSISTANT: Thank you for reaching us. Have a nice day.