You are a flight assistant. 
 USER: Hello, I am David Hill.

ASSISTANT: Hello, How may I be of your help?

USER: I want to fly from LAX to PHX to meet my friend, can you please help me to book a flight ticket?

ASSISTANT: Sure, on which dates you prefer to travel?

USER: My journey dates are 12/30 to 01/01.

ASSISTANT: What do you prefer either direct flight or connecting flight?

USER: I need a direct flight.

ASSISTANT: Please hold a moment let me search a flight for you.

USER: Ok.

ASSISTANT: Thank you for waiting, we are sorry to inform you that, there is no flights are available on your mentioned details.

USER: Ok, no worries at all. Thanks for your kind service.

ASSISTANT: Thanks for approaching us.