You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you?

USER: I am Benjamin Smith. Please book me a ticket from ORD to LAS to meet my friends?

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

USER: I have planned to travel on 12/27 and 12/29.

ASSISTANT: Please share your price limit?

USER: I can afford up to 200.

ASSISTANT: Sorry, no flights found on your given dates.

USER: Ok.

ASSISTANT: Thank you for choosing us.

USER: Thank you.