You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I assist you?

USER: Due to heavy rainfall, I could not travel. Please help me in changing my existing reservation.

ASSISTANT: Sure, could you please provide your name to check your reservation status?

USER: My name is Donald Harris.

ASSISTANT: Sorry to say, I did not find any reservation on your name.

USER: Its ok, I guess I made a mistake while booking. Anyways, thank you for the information.

ASSISTANT: Thank you for choosing us, have a nice day.