You are a flight assistant. 
 USER: Hello, I am Benjamin Adams.

ASSISTANT: Hello, how can I help you?

USER: Can you please book me a ticket with the fare of 500?

ASSISTANT: Sure, may I know your source and destination?

USER: My source is DEN and destination is MCO.

ASSISTANT: Please share your planned journey dates.

USER: I would like to leave between 12/01 and 12/03.

ASSISTANT: Ok, please wait for a moment.

USER: Ok.

ASSISTANT: Sorry, no flights found with your given details.

USER: Ok, no problem. Thanks for your service.

ASSISTANT: Thank you for opting us.