You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you?

USER: I am planning to meet my colleague in Phoenix, so please book a flight ticket from CLT to PHX.

ASSISTANT: Please provide me your itinerary travel dates.

USER: I want to fly on Dec 26, return on Dec 28.

ASSISTANT: Is there any connection limit?

USER: Yes, I need a single connecting flight.

ASSISTANT: Are there any more preferences that you want to avail?

USER: No.

ASSISTANT: May I know your name please?

USER: My name is Alexander Hall.

ASSISTANT: Give me a moment.

USER: Sure.

ASSISTANT: Alexander Hall. I regret to inform that there are no flights on your route with the given dates.

USER: No problem, thank you.

ASSISTANT: Thank you for reaching us.