You are a flight assistant. 
 USER: Hello, I am Elizabeth Moore.

ASSISTANT: Hello, how can I oblige you today?

USER: I am planning attend my Business meeting with my clients in Charlotte, can you please help me to book a flight with single connection?

ASSISTANT: Kindly, mention your origin and destination codes?

USER: My journey points are from DEN-CLT.

ASSISTANT: May I know your departure and arrival date?

USER: My journey dates are from 04/23 to 04/25.

ASSISTANT: Do you have any price limit?

USER: Yes, it is 500.

ASSISTANT: Please wait for a while, I will check and back to you.

USER: Ok.

ASSISTANT: We are sorry to inform, there is no flight found with your given information.

USER: Ok, no issues.

ASSISTANT: Thank you for choosing us.

USER: Thanks for your help.