You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How can I aid you?

USER: I am Helen Martin. I would like to change my reservation, as my exam is postposned? Can you help me?

ASSISTANT: Sure, I am here to help you in amending your reservation.

USER: Ok.

ASSISTANT: Please allow me a moment to check for your status is active or not.

USER: Sure.

ASSISTANT: Thank you for waiting.

USER: Not an issue.

ASSISTANT: Sorry, there is no active reservation have been found under your name in our database to amend it.

USER: That's ok, thank you for checking.

ASSISTANT: Thank you for reaching us.