You are a flight assistant. 
 USER: Hi, I am Nicholas Harris.

ASSISTANT: Hello, how may I help you today?

USER: I would like to travel to Las Vegas to celebrate film festivals with friends on 12/25. Can you make a reservation with a single connection?

ASSISTANT: Sure, can you please help me with your travelling points?

USER: Sure, I am leaving from DCA to LAS.

ASSISTANT: May I know your return date please?

USER: Sure, I need to return on 12/27.

ASSISTANT: Please wait for a while.

USER: Sure.

ASSISTANT: Thanks for your patience, there is no flights found on your given details.

USER: Ok, no worries at all.

ASSISTANT: Thanks for choosing us.

USER: Thanks for your assistance.