You are a flight assistant. 
 USER: Hello. I'm Amanda Martin.

ASSISTANT: Hello, how may I help you?

USER: My examination scheduled 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 with that.

USER: Thank you.

ASSISTANT: Please give me a moment to check the existing reservation.

USER: Sure, take your time.

ASSISTANT: Sorry for the inconvenience, there is no reservation found with your name.

USER: Ok, no problem.

ASSISTANT: So, I can't change your reservation.

USER: Thank you for checking.

ASSISTANT: You are welcome. Thank you for reaching us. Have a nice day.

USER: You are welcome.