You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I help you today?

USER: Myself Christopher Parker, I am willing to travel Vegas this weekend. Can you please help me in reserving the ticket from DEN to LAS?

ASSISTANT: Sure, when you are willing to travel?

USER: I am willing to drop-off Jan 18 and again I will retrieve on Jan 20.

ASSISTANT: Do you have any specifications?

USER: I mostly prefer for single connection, I can afford only 1000. Can you please check for this?

ASSISTANT: Which class do you like to prefer?

USER: I am comfortable with any class.

ASSISTANT: Ok, please wait for some time.

USER: Sure.

ASSISTANT: Thanks for waiting. Sorry, there are no flights found with your specifications.

USER: Not a big deal, anyway thank you very much for your kind service.

ASSISTANT: Thank you for reaching us.