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 out.

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

USER: My name is Deborah Hall.

ASSISTANT: There is no reservation found with your details, Hall.

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

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