You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Kimberly Collins.

ASSISTANT: How can I help you?

USER: Will you please help me to book a ticket from PHX to DTW?

ASSISTANT: Sure. Can I know your travelling dates?

USER: My travelling dates are on Jan 19 and 21.

ASSISTANT: Do you have any preference?

USER: I need a direct flight.

ASSISTANT: Found ticket with United airlines for price 200 having flight number 1018.

USER: Can you please make sure that my depart and return time should be at evening?

ASSISTANT: Sorry, no flights found.

USER: Ok, thank you for informing me.

ASSISTANT: Thank you.