You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you?

USER: I would like to change my existing reservation, please help me with this.

ASSISTANT: Sure, may I know your name please to check the reservation status?

USER: My name is Katherine Garcia.

ASSISTANT: Garcia, there is no reservation found with your details.

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

ASSISTANT: Thank you for reaching us, have a good day.