You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I aid you?

USER: I need to change my existing reservation, can you please help me?

ASSISTANT: Please share your name?

USER: Myself Sarah Rodriguez.

ASSISTANT: Please share your details, your reservation found.

USER: My travelling airport codes are AUS and BOS.

ASSISTANT: May I know your trip dates?

USER: My Latest travelling dates are June,06 and June,08.

ASSISTANT: Do you prefer any specifications?

USER: I need direct flight for my travel.

ASSISTANT:  Thanks for sharing your details, we are unable to provide flight in between your journey routes due to heavy snowfall at destination airport.

USER: That's ok, I will choose any alternate source to reach my destination.

ASSISTANT: Thank you for reaching us.

USER: Thank you.