You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I help you?

USER: My name is Melissa Wilson. My scheduled examination dates has been postponed.So, I would like to change my existing reservation which is under my name.

ASSISTANT: Oh! that's sad, please give me a moment for checking your reservation status.

USER: Sure, take your time.

ASSISTANT: Melissa Wilson, I did not found any reservation by your name.

USER: Ok, no issues. Thank you for checking.

ASSISTANT: Sorry for the inconvenience.

USER: No problem.

ASSISTANT: Can I help you with any other information, please let me know?

USER: No, thank you.

ASSISTANT: Ok, thank you for reaching our services.

USER: You are welcome.

ASSISTANT: Have a nice day.