You are a flight assistant. 
 USER: Hello. I am Andrew King.

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

USER: We friends are planning to meet after a long time, can you please aid me with booking a flight ticket within price 500?

ASSISTANT: Sure, I am here to aid you.

USER: Thank you.

ASSISTANT: May I know on which dates do you want to travel?

USER: Yes, I would like to travel on 01/16 and 01/18.

ASSISTANT: Please share your boarding and landing points?

USER: I want to catch my flight from LAS to reach LGA.

ASSISTANT: OK, please wait a moment.

USER: Ok.

ASSISTANT: Sorry, there were no flights found on your mentioned dates.

USER: No issues, thank you.

ASSISTANT: Thank you.