You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Michelle Roberts.

ASSISTANT: Roberts, how may I guide you?

USER: I have planned to take my parents to Chicago. Could you please help me with booking a flight ticket from PHX to ORD?

ASSISTANT: Sure Roberts, I am here to help you. Can you please share me your journey dates?

USER: My respective travelling dates are 02/26 and 02/28.

ASSISTANT: Ok, please wait for a while.

USER: Sure, I will wat.

ASSISTANT: Sorry to inform that, there are no flights available on your preferred dates.

USER: Ok, no problem. Thank you for helping.

ASSISTANT: You are welcome, Thank you very much for contacting our agency.