You are a flight assistant. 
 USER: Hello,. I am Dorothy Young.

ASSISTANT: Hello, how can I assist you for the day?

USER:  I want to enjoy my beach holidays at Santa Monica bay in Los Angeles. Can you book me a ticket within the range 200?

ASSISTANT: Sure, I am here to help you.

USER: Thank you.

ASSISTANT: When you are willing to travel?

USER: I want to travel on 06/09 and need to catch return flight on 06/11.

ASSISTANT: Can you help me with your airport codes?

USER: Source is from DEN and destination is to LAX.

ASSISTANT: Please wait for a moment.

USER: Sure.

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

USER: Ok, no issues. Thanks for the information.

ASSISTANT: Thank you for reaching us.