You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you?

USER: My name is Ruth Harris, I want to book a flight ticket from PHX to DEN, can you help me with booking?

ASSISTANT: Sure, may I know your trip dates?

USER: My trip dates are June 16 and June 18.

ASSISTANT: Do you have any other requirements?

USER: My depart time is evening.

ASSISTANT: Ok, please wait for a while.

USER: Sure, I need a connecting flight.

ASSISTANT: Sorry, we regret to inform you that there is no flight available as per your request.

USER: Ok, no problem. Thank you.

ASSISTANT: My pleasure.