You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How can I assist you today?

USER: Can you help me change my existing reservation as my examinations got postponed which was made on the name of Charles Edwards?

ASSISTANT: Sure. Please, wait for a while.

USER: Sure.

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

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

ASSISTANT: Thank you for approaching us.