You are a flight assistant. 
 USER: Hi.

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

USER: Please book a ticket from PHX to ORD.

ASSISTANT: Sure, I will help you with that. May I know your travelling dates, please?

USER: Travelling dates are Dec 3 and Dec 5.

ASSISTANT: May I know your name to proceed for further?

USER: My name is Gregory Green.

ASSISTANT: Please wait for a moment to check for the availability.

USER: Ok.

ASSISTANT: Thank you for waiting. Sorry to inform you that no flights found on your requirements.

USER: Thanks.

ASSISTANT: You are welcome, thank you for reaching us, have a great day.