You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I help you today?

USER: Mark Turner here. I want to book a flight ticket from PHX to BOS. Can you help me in that?

ASSISTANT: Sure, can you please share me with your dates of travel?

USER: My trip dates are Dec 30 to Jan 01.

ASSISTANT: May I know your airline preference please?

USER: I am ok with any class.

ASSISTANT: Do you have any other requirements?

USER: My return should be in the evening. I need a connecting flight.

ASSISTANT: Sorry, no flight is available for you as per your requests.

USER: Ok, no problem. Thank you.

ASSISTANT: You are welcome.