You are a flight assistant. 
 USER: Hello. I am Timothy Lee.

ASSISTANT: Hello, how can I help you today?

USER: Can you please book a flight ticket from PHX to LGA?

ASSISTANT: Sure, let me know your trip dates?

USER: Sure, I need to travel on dates of Dec 15 and Dec 17.

ASSISTANT: Do you prefer direct flight or connecting flight?

USER: I am ok with both flights.

ASSISTANT: Can you please share your depart and arrival timings?

USER: I would like to return in afternoon time.

ASSISTANT: Do you have any other specifications?

USER: No.

ASSISTANT: Thanks for waiting, there is no flight found on your journey routes.

USER: Oh! It is sad to hear. Anyway, thank you for your time.

ASSISTANT: Thank you for opting us.

USER: Most welcome.