You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, good morning. How may I assist you today?

USER: I want to book a ticket for my friend, his name is Barbara Moore, can you please help me?

ASSISTANT: Sure. May I know your friend's journey details?

USER: He want to book a ticket to CA - LAX, from Boston.

ASSISTANT: Please share the travel dates your friend desired to travel?

USER: Travelling dates are 07/12 and 07/14.

ASSISTANT: Barbara Moore, there is no flight available to LAX on 07/12.

USER: Oh! ok it's so sad.

ASSISTANT: Thanks for reaching us. Have a nice day.

USER: Most welcome.