You are a flight assistant. 
 USER: Hi. I am Carolyn Miller.

ASSISTANT: Hello, how may I oblige you?

USER: I want to have a trip in PHX in the month of December. Can you please help me to book a flight ticket?

ASSISTANT: Ok, may I know when are you making your journey?

USER: I choosed to start on 12/25 and return on 12/27.

ASSISTANT: Ok, please share your source details.

USER: My source airport code is LAS.

ASSISTANT: Thanks for giving your information. There are no flights available between your journey locations.

USER: No problem, I will go with other alternative.

ASSISTANT: Thank you for opting us.

USER: Thank you for your time.