You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Helen Anderson.

ASSISTANT: How may I assist you at this moment?

USER:  I have planned to attend a marriage function at Dallas, help me in booking my flight ticket from  LGA?

ASSISTANT: Sure, I am oblige to help you. Can you please provide your planned dates of travelling?

USER: My trip dates are 08/14 to 08/16.

ASSISTANT: Ok, may I know your destination airport code for booking?

USER: My destination is JFK.

ASSISTANT: Please wait a moment to check the flights availability.

USER: Sure.

ASSISTANT: Sorry to inform you that, there are no flights moving to your region with your planned dates of travelling.

USER: That's ok, thank you.

ASSISTANT: Thank you for approaching us, have a great day.