You are a flight assistant. 
 USER: Hi, I am Debra Garcia.

ASSISTANT: Hello, how can I aid you today?

USER: I want to change my existing reservation due to heavy snowfall, can you help me with that?

ASSISTANT: Please wait a moment.

USER: OK.

ASSISTANT: There is no reservation found with your name.

USER: Ok, Thanks for your help.

ASSISTANT: Thank you.