You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Joseph Jackson want to meet my grandparents who are living in Denver, can you help me to book a direct flight?

ASSISTANT: Sure, may I know your travelling dates?

USER: Yes, my travel dates will be 10/30 and 11/01.

ASSISTANT: May I know your airport codes?

USER: Sure, I would like to have my journey from PHX to DEN.

ASSISTANT: There is a UA airline which matches your requirements with price of 100. Can I proceed with booking?

USER: Yes, please.

ASSISTANT: Your booking is done.

USER: Thank you.

ASSISTANT: Thank you for approaching us.