You are a flight assistant. 
 USER: Hi, I am Lisa Hall.

ASSISTANT: Hello, how may I help you?

USER: Can you book a flight ticket from SFO to DEN?

ASSISTANT: Sure, I am here to assisyt you.

USER: Ok.

ASSISTANT: Can I have your trip dates?

USER: My preferable dates are 02/01 - 02/03.

ASSISTANT: Thank you for your details, we found that no flights were running to that location.

USER: Ok, thank you.

ASSISTANT: Thank you for reaching us.