You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, welcome to our agency. How may I help you?

USER: Due to heavy rainfall, I am unable to reach the airport on time. Could you please help me in changing my existing reservation?

ASSISTANT: Sure, I will help you with that. May I know your name please?

USER: My name is Brenda Anderson.

ASSISTANT: Brenda, no reservation has been found on your name in our records.

USER: Ok, no issue. Thank you for your information.

ASSISTANT: Thank you for choosing us.