You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I help you today?

USER: I am planning my holiday trip to travel New York. Can you please help me in reserving the ticket from BOS to LGA?

ASSISTANT: Sure, could you please help me with your dates of journey?

USER: I would like to travel on Aug 15 and again I will return back on Aug 17.

ASSISTANT: May I know your name please?

USER: Myself David Brown.

ASSISTANT: Are you looking for any other help from my side please?

USER: My airline preference is normal-cost.

ASSISTANT: Ok, wait for a mean while please.

USER: Sure.

ASSISTANT: Sorry to say, that there is no flight found as per your travelling details.

USER: Not a big deal, anyhow thank you very much for your kind information.

ASSISTANT: You are welcome.