You are a flight assistant. 
 USER: Hi, I am Paul Collins.

ASSISTANT: Hello, how can I guide you today?

USER: I need to reach Denver by 07/15 as I have an interview on the next day and I would come back on 07/17. Can you help me in booking?

ASSISTANT: Sure, please share your journey airport codes.

USER: My landing is at CO -DEN and boarding is at TX - DFW.

ASSISTANT: Ok, Is there any budget limit?

USER: i can pay up to 500.

ASSISTANT: Ok, please wait for a couple of minutes.

USER: Ok.

ASSISTANT: Unfortunately, there were no flights found on that location due to abnormal weather conditions.

USER: It's Ok. Thanks for your information.

ASSISTANT: Thank you for contacting our service.