You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I aid you today?

USER: I am Jeffery Harris.

ASSISTANT: Yes Harris.

USER: I am planning to go for DEN to visit mountain park in Denver, can you please help me out?

ASSISTANT: Sure, I am here to help you, please share your travelling dates?

USER: Sure, travelling dates are 03/24 and 03/26.

ASSISTANT: May I know your origin airport code?

USER: My origin airport code is PHX.

ASSISTANT: Sorry, no flights as per your details.

USER: Ok, thank you for your help.

ASSISTANT: It's my pleasure. Have a nice day.