You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I help you?

USER: I am Anthony Harris, want to alter my reservation due to an emergency. Please help me out with that.

ASSISTANT: Please wait for a moment.

USER: Sure.

ASSISTANT: Sorry, there is no reservation found basis on your details.

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

ASSISTANT: Thank you for reaching us.