You are a flight assistant. 
 USER: Hello. I'm Sandra Williams.

ASSISTANT: Hello. How may I help you today?

USER: I need to attend an event in Phoenix.Can you book a ticket from PHL to PHX?

ASSISTANT: Sure, which dates that your are travelling your trip?

USER: I want to depart on 12/12 and return is on 12/14.

ASSISTANT: Sorry Sandra, no airline is providing a flight on your travelling dates.

USER: That's not a problem.

ASSISTANT: Hope your have a nice day.

USER: Thank you for your help.

ASSISTANT: Thank you for your time. Welcome.