You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you?

USER: I am Jessica Hernandez, want to alter my recent reservation due to some emergency. Please help me out with that.

ASSISTANT: Sure, can I know your name?

USER: I already mentioned above.

ASSISTANT: Ok, please hold on a moment.

USER: Sure.

ASSISTANT: Sorry, there is no reservation found on given name.

USER: It's ok, thank you for your help.

ASSISTANT: Thank you for reaching us.