You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you?

USER: I am Ronald Edwards. I want to book a flight from LAS to reach IAH to meet my high school friends. Can you book a connecting flight for me?

ASSISTANT: Sure, please share me your travelling dates?

USER: I have planned to travel on Dec 23 and return on Dec 25th.

ASSISTANT: Do you have any class preference?

USER: No.

ASSISTANT: Do you have any connection limit?

USER: I prefer connecting flight.

ASSISTANT: Sorry, there were no flights with your given dates.

USER: Ok, no problem. Thank you.

ASSISTANT: Thank you for reaching us.