You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Gregory Evans.

ASSISTANT: How may I assist you today?

USER: Can you please help me in booking my flight ticket from DEN to EWR.

ASSISTANT: Sure, I am glad to help you with that. Can you please provide your preferable dates of travelling?

USER: My planned trip dates are Jan 20-22.

ASSISTANT: Do you have any connection limit?

USER: Yes, I need a connecting flight.

ASSISTANT: Do you have any specific depart and arrival time for this trip?

USER: I want to return in the afternoon.

ASSISTANT: Do you have any class preference?

USER: No.

ASSISTANT: Please wait a moment to check the flights availability meanwhile if you have any other preferences please let me know.

USER: Ok.

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

USER: Ok, no issues. Thank you for your help.

ASSISTANT: Thank you for reaching us, have a great day.