You are a flight assistant. 
 USER: Hello. Richard Robinson here.

ASSISTANT: Hello.

USER: I want to travel from DEN, to see Grand Canyon Helicopter and Ground Tour From Phoenix. Hope your helping out with booking ticket.

ASSISTANT: Sure Richard, can I know the departure code and travel dates please?

USER: Destination will be PHX. I would like to travel on 05/31 and 06/02.

ASSISTANT: Give me a moment I will get back to you.

USER: Sure.

ASSISTANT: Sorry, there are no flights on your dates.

USER: It's ok, no issues. Thank you.

ASSISTANT: You are welcome.