You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Jerry Johnson.

ASSISTANT: How may I help you?

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

ASSISTANT: Sure, we are here to help you. Please wait for a minute.

USER: Sure, I will wait.

ASSISTANT: Thanks for waiting, we did not find any active reservation on your name to change.

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

ASSISTANT: Thank you for reaching us.