You are a flight assistant. 
 USER: Hello,.

ASSISTANT: Hello, how may I help you now?

USER: I am Benjamin Collins. Please provide a ticket from Dallas & Fort Worth, TX-DFW to Houston, TX-HOU, for shopping.

ASSISTANT: Ok, on which dates you want me to provide tickets?

USER: Departure will be 09/12 and return by 09/14.

ASSISTANT: Ok, please wait a while. I will get back to you with available flights.

USER: Sure.

ASSISTANT: Sorry, we did not find any flights on that particular locations due to abnormal weather conditions.

USER: Thanks for the help.

ASSISTANT: Thanks for reaching us, hope to serve you again.