You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Christopher Evans.

ASSISTANT: How can I help you?

USER: I am planning a trip with my father.

ASSISTANT: Where would you like to travel?

USER: Can you please check the flights availability on 07/27 to 07/29? Yes, I am planning to visit PHX.

ASSISTANT: Sure, please tell your origin location?

USER: I want to start my journey from DTW.

ASSISTANT: Sorry, there are no flights available with your request.

USER: That's bad. Anyway, thank you for your help.

ASSISTANT: Thank you and have a nice day.