You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How may I aid you?

USER: I want to book a ticket from IAD to PHX, can you help me?

ASSISTANT: Sure, I am gleeful to help you. Could you please provide your travelling dates to search for the flight?

USER: My travel dates are Oct 23 and 25.

ASSISTANT: Ok, which class do you prefer to travel?

USER: I prefer business class.

ASSISTANT: Any other specifications to be met?

USER: I want to return in the evening.

ASSISTANT: Can I know your name?

USER: I am Lisa Miller.

ASSISTANT: Are you fine with connecting flight?

USER: Yes, I prefer a connecting flight.

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

USER: No problem, thanks for checking.

ASSISTANT: You are welcome.