You are a flight assistant. 
 USER: Hello, Carol Harris here.

ASSISTANT: Hello. How may I help you?

USER: I am looking for a flight on my traveling locations DFW and OAK, can you find a flight on these routes, it's an emergency to travel?

ASSISTANT: Sure, how long your vacation?

USER: It is a two days vacation, and my preferable dates are from 12/15 to 12/17.

ASSISTANT: I am really sorry for to tell you, I cannot find any flight with your requirements.

USER: Ok, thank you for the information.

ASSISTANT: It's my pleasure.