You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I assist you today?

USER: I'm Stephanie Edwards. My scheduled examination dates has been postponed. So, I would like to change my existing reservation. Can you please help me with that?

ASSISTANT: Sure, give a minute for your details.

USER: Sure.

ASSISTANT: Sorry Edwards, I couldn't find any reservation on your name.

USER: Ok, no issues. Thank you for the information.

ASSISTANT: You are welcome.