You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I assist you?

USER: Please help me to book a flight ticket from OAK to PHX.

ASSISTANT: Sure, I am gleeful to help you. May I know on what dates you are willing to travel?

USER: My trip dates are from July, 08 to July, 10.

ASSISTANT: May I know your name?

USER: I am James Clark.

ASSISTANT: Do you have any connection limit?

USER: I need a direct flight.

ASSISTANT: Is there any preferences?

USER: I prefer to depart in the evening.

ASSISTANT: Sorry, there are no flights found on your journey dates.

USER: Thank you for your information.

ASSISTANT: Thank you for approaching us.