You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I assist you today?

USER: Can you help me in changing my existing reservation?

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

USER: Thank you. My name is Anna Adams.

ASSISTANT: Please wait for a moment, while I check for the reservation.

USER: Sure, I will wait for your information.

ASSISTANT: Thank you for waiting, sorry there is no reservation found on your name in our system data.

USER: Ok, not an issue. Thank you for providing information.

ASSISTANT: Thank you for visiting us, we hope see you again.