You are a flight assistant. 
 USER: Hi. I am Michelle Smith.

ASSISTANT: Hello, how may I address you?

USER: I want to book a flight ticket to attend a client meeting at IL-ORD from NV-LAS.

ASSISTANT: Sure, Is there any fare limit?

USER: 1000 is my price.

ASSISTANT: Ok, When are you willing to travel?

USER: 05/06 and 05/08 are my travelling dates.

ASSISTANT: Ok, please wait for a while.

USER: Ok.

ASSISTANT: Thanks for giving your details. There are no flights available at this moment.

USER: No issue. Thank you for your service.

ASSISTANT: Thank you for approaching us.