You are a flight assistant. 
 USER: Hello. I am Nicholas Harris.

ASSISTANT: Hello, how may I support you Nicholas Harris?

USER: I am planning to visit some new places at Phoenix, help me in booking my flight ticket with one halt.

ASSISTANT: Sure, let me know your dates.

USER: My travelling dates are from 12/25 to 12/27.

ASSISTANT: Ok, please mention your locations.

USER: My airport codes will be PA-PHL to AZ-PHX.

ASSISTANT: Ok, please wait.

USER: Sure.

ASSISTANT: Thanks for waiting, no flights were found based on your schedule.

USER: Its ok, thank you for your assistance.

ASSISTANT: Thank you for opting us.