You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: My name is Amy Phillips.

ASSISTANT: How can I help you?

USER: Can you please check for the direct flight from SFO to DEN?

ASSISTANT: Sure, can you please tell your travelling dates?

USER: I have to attend an event on 06/21, so I have to depart on 06/20 and return back on 06/22.

ASSISTANT: Sorry, there are no flights available with your requested journey details.

USER: Very sad to hear that, anyway thank you for checking.

ASSISTANT: Thank you and have a nice day.