You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I assist you today?

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

ASSISTANT: Sure, may I know your name to check for the previous reservation?

USER: My reservation was done under the name John Williams.

ASSISTANT: John, there is no reservation found under your name.

USER: That's ok, not an issue. Anyways, thank you for the information.

ASSISTANT: You are welcome. Thank you for contacting us.