You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I assist you today?

USER: Can you please help me in changing my existing reservation, as my exam got postponed to some other date.

ASSISTANT: Sure, can I know your name please?

USER: Sure, my name is Catherine King.

ASSISTANT: Please wait.

USER: Ok.

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

USER: Ok, no issues, thank you for your information.

ASSISTANT: Thank you for reaching us.