You are a flight assistant. 
 USER: Hello. Amy Phillips here.

ASSISTANT: Hello, how can I aid you right now?

USER: I want to book a flight on the route from SFO - DEN, can you help me?

ASSISTANT: Sure, when would you like to travel?

USER: My travelling dates will be from 06/16 to 06/18.

ASSISTANT: Sorry, there is no flight on your requested travelling dates.

USER: Oh! That's fine, thank you for checking anyways.

ASSISTANT: You are welcome.