You are a flight assistant. 
 USER: Hello,. I am Cynthia Thomas.

ASSISTANT: Hello, how can I assist you for the day?

USER: Can you please assist me in booking a flight ticket to PHX from IAD?

ASSISTANT: Sure, I am here to help you.

USER: Thank you.

ASSISTANT: When you are willing to travel?

USER: I am planning to travel on 03/19 and return on 03/21.

ASSISTANT: Please wait for a moment.

USER: Ok.

ASSISTANT: Sorry, we found no flights on your given dates.

USER: Ok, no problem. Thank you.

ASSISTANT: Thank you for reaching us.