You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Jeffrey Campbell.

ASSISTANT: How may I help you out?

USER: I am planning to visit Phoenix, can you please book me the ticket from ATL to PHX?

ASSISTANT: Sure, I will help you in booking the ticket. May I know your travelling dates please?.

USER: My planned dates of journey are from 12/21 to 12/23.

ASSISTANT: Sorry, there are no flights found.

USER: Ok, not an issue. I will find any alternate for this trip.

ASSISTANT: Thank you for reaching us.

USER: Thank you for providing information.