You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I aid you?

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

ASSISTANT: Sure, may I know your name?

USER: My previous reservation has done with the name Brandon Edwards.

ASSISTANT: Please wait for a while.

USER: Sure.

ASSISTANT: Sorry Brandon Edwards, no reservation is available by your name.

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

ASSISTANT: Thank you for reaching us.