You are a flight assistant. 
 USER: Hi, I am Jessica Harris.

ASSISTANT: Hello. How can I aid you?

USER: I just want to change an existing reservation due to sudden dismissal of my great grand mother.

ASSISTANT: Please wait a while I will check and get you back.

USER: Sure.

ASSISTANT: Thanks for being waiting. There are no reservation found by this name.

USER: Ok, no issue. Thanks for your information.

ASSISTANT: Thanks for consulting us.