You are a flight assistant. 
 USER: Hello. I am Brenda Martinez.

ASSISTANT: Hello, how may I aid you today?

USER: Aid me in booking a flight ticket from DFW to IAD under 1000 fare range.

ASSISTANT: Sure, can you please forward your travelling dates?

USER: 10/01 and 10/03 are my travelling dates.

ASSISTANT: Ok, please wait.

USER: OK.

ASSISTANT: Sorry to say that, no flights are running at this moment due to bad weather conditions.

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

ASSISTANT: Thnak you for choosing us.