You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Samantha Edwards.

ASSISTANT: How shall I assist you?

USER: I would like to book a ticket to Las Vegas, can you please help me out?

ASSISTANT: Yes, I am here to help you in flight ticket booking. May I know you departure and arrival dates of your journey?

USER: I am travelling o these dates 07/09 and 07/11.

ASSISTANT: May I know your regional airport codes?

USER: I am flying from PHX to LAS.

ASSISTANT: I am sorry to say, no flights that are moving to your region due to unavailable of flights based on your request.

USER: Ok no problem, thank you for your services.

ASSISTANT: You are most welcome and have a great day.