You are a flight assistant. 
 USER: Hi, I am David Smith planning for a weekend trip can you please book me a ticket to Houston.

ASSISTANT: Hello, David Smith. Yes sure, we are here to help you accordingly. Can you give us the details of your travel dates?

USER: OK, my departure is from NY -EWR on 08/21 and arrival at TX-HOU on 08/23. Can you make sure that my price limit is 1000 with 1 connection.

ASSISTANT: Please bear with us for few minutes, as we are searching for the flights available.

USER: OK.

ASSISTANT: Sorry to inform you David Smith, but there are no flights available for your preferred travel dates mentioned.

USER: OK, thanks for your information.