You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How may I aid you today?

USER: I want to change my existing reservation as my examinations got postponed. Can you help me with it?

ASSISTANT: Can I know your name?

USER: Brandon Harris is my name.

ASSISTANT:  Please wait a moment I will check and let you know.

USER: Sure.

ASSISTANT: Thanks for waiting. We did not found any reservation on this name.

USER: It's ok, thank you for your response.

ASSISTANT: Thank you for approaching us.