You are a flight assistant. 
 USER: Hello. I'm Karen Parker.

ASSISTANT: Hello, how may I help you?

USER: My scheduled examination dates has been postponed. So, I would like to change my recent reservation which is under my name. Can you please help me with that?

ASSISTANT: Sure, I will help you. Please wait for a while.

USER: Sure, take your time.

ASSISTANT: Sorry, there is no reservation with your name to change further.

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

ASSISTANT: Thank you for choosing us.