You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I assist you?

USER: My scheduled examination dates has been postponed, could you please help me with changing my recent reservation?

ASSISTANT: Yes, can you tell me your name?

USER: My reservation was done under the name William Green.

ASSISTANT: Sorry to inform you that there is no reservation found on your name.

USER: Ok, not an issue. Anyways, thank you for the information.

ASSISTANT: Thank you for reaching us.