You are a flight assistant. 
 USER: Hello. I'm Ashley Clark.

ASSISTANT: Hello, what type of help you are looking from our service?

USER: I am planning to attend business meeting at New York, can you please help me with booking a flight ticket?

ASSISTANT: Ok, I am here to help you. Can you please let me know your planned dates of journey?

USER: Sure, I would like to take off on 05/15 and return back on 05/17.

ASSISTANT: Please, provide your location codes.

USER: My source airport code is PHL and the destination airport code is LGA.

ASSISTANT: Sorry Clark, there is no flight to your destination on your preferable dates.

USER: Ok, no issues. Thank you for checking.

ASSISTANT: My pleasure, thank you for choosing our service.

USER: You are welcome.