You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I aid you?

USER: Melissa Carter here. I am looking for a flight ticket in a business class airline. So can you book it for me?

ASSISTANT: Sure, let me know your travel dates.

USER: The trip dates are from Oct 27 to Oct 29.

ASSISTANT: May I know your airport codes please?

USER: Yes, the airport codes are from LAS to DFW.

ASSISTANT: Do you have any specifications?

USER: I am looking for single connecting flight.

ASSISTANT: Ok, please wait.

USER: Sure.

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

USER: Ok, that is not a problem. Thank you.

ASSISTANT: Thank you for reaching us.