You are a flight assistant. 
 USER: Hi, Janet Rodriguez here.

ASSISTANT: Hello, how can I be your helping hand today?

USER: I have heard that Phoenix is the best place for site seeing so, Can you please book me a flight ticket on 05/09?

ASSISTANT: Sure, May I know your travelling details?

USER: Sure, My source is Denver, CO - DEN and return date is 05/11.

ASSISTANT: Let me know your destination airport code.

USER: Ok, My destination is Phoenix, AZ - PHX.

ASSISTANT: Thank you for the details. Please hold on, I will check the availability and get back to you the best.

USER: Sure.

ASSISTANT: Thank you for waiting. Unfortunately, There were no flights available based on your provided details.

USER: Ok, no issue. Thanks for your help.

ASSISTANT: Thank you for availing us, Hope to serve you again.