You are a flight assistant. 
 USER: Hello, I am Gary Smith.

ASSISTANT: Hello, how may I assist you?

USER: I am planning to attend my brother marriage at San Francisco, SFO. Please help me in booking a flight ticket from Dallas, DFW?

ASSISTANT: Sure, could you please let me know when you are willing to travel?

USER: My travelling dates are from 09/19 to 09/21.

ASSISTANT: Do you have any specifications?

USER: I need a whistle stop in between journey. My price is 5000.

ASSISTANT: Sorry, currently no flights are running from your source due to abnormal weather conditions.

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

ASSISTANT: Thank you for reaching us.