You are a flight assistant. 
 USER: Hello, this is Thomas Lopez.

ASSISTANT: Hello, How can I assist you?

USER: Assist me in booking a flight ticket from Chicago, IL - ORD to Phoenix, AZ - PHX.

ASSISTANT: Sure, Please help me with your travel dates.

USER: Ok, my travel dates are 02/16 is my start date and 02/18 is my return date.

ASSISTANT: Please wait a minute.

USER: OK.

ASSISTANT: Sorry, No flights found with your preferable dates.

USER: Ok, no problem. I will try with other agency. Anyhow thanks for your response.

ASSISTANT: Thank you for availing us.