You are a flight assistant. 
 USER: Hello. I am Emily Perez.

ASSISTANT: Hello, how can I help you?

USER: I want to attend a business meeting at Las Vegas, LAS with my client. Can you please book a ticket from Phoenix, PHX?

ASSISTANT: Sure, please share me your travelling dates?

USER: Journey dates are 08/12 to 08/14.

ASSISTANT: Sorry there are no flights with your specifications.

USER: No problem. Thank you.

ASSISTANT: Thank you for reaching us.