You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I assist you?

USER: I am Karen King. I want to go to DFW for my sister's baby shower function, please help me with booking the ticket from DCA.

ASSISTANT: Sure, king may know your travelling dates?

USER: Yes, 11/01 and 11/03 are my travel dates. Please find me a flight with price limit of 200.

ASSISTANT: Sorry, king no flights available.

USER: It's ok. Thank you for the information.

ASSISTANT: Thank you for contacting us.