You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, How exactly I can serve you the best today?

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

ASSISTANT: Sure, may I know your good name?

USER: I am Nicole Campbell.

ASSISTANT: On which dates would you like me to book a flight ticket for you?

USER: My trip dates are 28 to 30 of Jan.

ASSISTANT: Do you prefer a connecting or direct flight?

USER: I need a direct flight.

ASSISTANT: Are there any more specifications?

USER: I prefer to return in the morning.

ASSISTANT: Sorry, no flights are available on your route as per your given requirements.

USER: Oh! that very sad to hear, thank you.

ASSISTANT: Thank you for reaching us.