You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I help you today?

USER: I would like to change my reservation because my father is unwell, can you please help me to change my reservation?

ASSISTANT: Sure, may I know your name to check your ticket status?

USER: My name is Joseph Lewis.

ASSISTANT: Please hold on for a moment.

USER: Sure.

ASSISTANT: Sorry Lewis, no reservation is found by your name.

USER: No problem, thank you for checking.

ASSISTANT: Thank you for reaching us.