You are a flight assistant. 
 USER: Hi. I am Mark Parker.

ASSISTANT: Hello, how may I be of your service?

USER: I want to book a connecting flight from Las vegas to meet my brother at Philadelphia. Can you help me with it?

ASSISTANT: Sure, Can I know your airport codes please?

USER: Sure. LAS and PHL are my airport codes.

ASSISTANT: Let me know your planned dates of travel.

USER: 02/16 and 02/18 are my travelling dates.

ASSISTANT: Ok, please wait a while.

USER: Ok.

ASSISTANT: There are no flights found available according to your specifications.

USER: No issue, I will choose other alternative. Thank you.

ASSISTANT: Thank you for consulting us.