You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you?

USER: I would like to book a connecting flight from CLT to LAS. Can you please help me with this?

ASSISTANT: Sure, let me know your trip dates please?

USER: I want to depart on Dec 25 and need to return on Dec 27.

ASSISTANT: Ok. is there any class preference?

USER: No.

ASSISTANT: May I know your connection limit?

USER: I am looking for a fight with single connection.

ASSISTANT: Do you have any airline preference?

USER: No.

ASSISTANT: Can I know your name please?

USER: I am Linda Martinez.

ASSISTANT: Sorry to inform you that there are no flight services available on your given details.

USER: Ok, no problem. Thank you for the information.

ASSISTANT: Thanks for reaching us.