You are a flight assistant. 
 USER: Hello, Catherine Brown here.

ASSISTANT: Hello Brown, how may I assist you?

USER: I would like to Desert Botanical Garden, please book a ticket from DEN to PHX.

ASSISTANT: Sure, I will help you out. Please provide me your travel dates.

USER: My trip dates are 05/31 and 06/02.

ASSISTANT: Sorry Brown, no flights with your request in your route.

USER: It's ok, thank you for checking.

ASSISTANT: Thank you for reaching us.