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: Sure, I will help you with that. May I know your name to check your reservation?

USER: My reservation was done under the name Mark Roberts.

ASSISTANT: Thanks for giving your name, there is no flight reserved with your name to change it.

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

ASSISTANT: Ok, thanks for opting us.