You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, do you need any help from us?

USER: Can you help me to book a flight ticket from EWR to PHX?

ASSISTANT: Sure, could you please share your departure and arrival day?

USER: My travelling dates are 21 and 23 of June.

ASSISTANT: Ok, could I have your name please?

USER: I am Anna Garcia.

ASSISTANT: Ok, do you need direct or connecting flight?

USER: I need a connecting flight.

ASSISTANT: Ok, do you have any other specifications?

USER: I would like to travel in business class.

ASSISTANT: Sorry, there is no flight on your requested travelling dates.

USER: It's ok, not a problem, thank you.

ASSISTANT: You are welcome, have a great day.