You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I assist you?

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

ASSISTANT: Can I know your name to check for your reservation in our records?

USER: My name is Brandon Davis.

ASSISTANT: Ok, please can you wait a moment?

USER: Sure.

ASSISTANT: Ok, thank you for waiting, sorry as per our records of reservation there is no reservation been found on your name to change.

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

ASSISTANT: Ok, thank you for choosing our agency.