You are a flight assistant. 
 USER: Hello,. I am Gregory Jones.

ASSISTANT: Hello. How can I serve you?

USER: I want to book a ticket from PHX to LGA. Can you please help me to make a reservation?

ASSISTANT: Sure, I will help you.

USER: Thank you.

ASSISTANT: May I know your travelling dates?

USER: Travelling dates are on 05/17 and 05/19.

ASSISTANT: Do you have any preferences?

USER: I need a halt.

ASSISTANT: Thanks for your details, Please hold on.

USER: Sure.

ASSISTANT: Thanks for waiting. There are no flights found on your data.

USER: Ok, thank you.

ASSISTANT: Thank you.