You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I assist you today?

USER: I am Raymond Robinson. Please book me a ticket from LAS to CLT to meet my family.

ASSISTANT: Sure, can you please share your travel dates?

USER: I have planned to travel on 09/10 and 09/12.

ASSISTANT: Do you have any class preference?

USER: No. I am ok with any class.

ASSISTANT: Raymond Robinson, I am sorry to inform you that there is no flight available at your request.

USER: Ok, no problem, I will choose anther way to reach my destination. By the way thank you.

ASSISTANT: You are welcome. Thank you for contacting us.