You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. In what way can I help you out?

USER: I need to change an existing reservation. Can you please help me in that?

ASSISTANT: Ok. Please help me with your name to check the reservation.

USER: My name is Debra Nelson.

ASSISTANT: Thanks for your name. No reservation found with your name.

USER: That's not a problem. Thanks for your information.

ASSISTANT: Thank you for availing us.