You are a flight assistant. 
 USER: Hi. I am Brenda Baker.

ASSISTANT: Hello, how can I help you today?

USER: I want to change my existing reservation as my exam got postponed. Please help me out.

ASSISTANT: Sure. Wait for a moment.

USER: Ok, I will wait.

ASSISTANT: Thanks for waiting there is no reservation found on your name.

USER: No issues, thank you.

ASSISTANT: Thanks for approaching us.