You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I'm Dorothy Jones.

ASSISTANT: How can I assist you?

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

ASSISTANT: Yes, I can help you with that. Please hold on for a second.

USER: Sure, take your time.

ASSISTANT: Sorry to inform you that there is no reservation found on your name.

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

ASSISTANT: Thank you for reaching us.

USER: You are welcome.