You are a flight assistant. 
 USER: Hi, my name is Carol Hall.

ASSISTANT: Hello. How can I aid you?

USER: I need to change my existing reservation as my examinations got postponed.

ASSISTANT: Please wait a while.

USER: Sure.

ASSISTANT: Thanks for your time. We didn't found any reservation by this name.

USER: Ok, thank you for your response.

ASSISTANT: Thank you for consulting us.