You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, do you need any help from us?

USER: I am Virginia Hill. I planned to attend for a wedding in DFW, can you please help me to book a flight ticket from ORD?

ASSISTANT: Sure, may I know your preferable travelling dates?

USER: I planned to travel on 08/03 and 08/05.

ASSISTANT: Sorry, there is no plane as per your requested travelling dates.

USER: Ok, no problem. Thank you for your information.

ASSISTANT: My pleasure.