You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I help you?

USER: I want to change my existing reservation due to bad health issues. Can you help me out?

ASSISTANT: Sure, can you share your name?

USER: I am Emma Miller.

ASSISTANT: Sorry, there is no reservation found under your name.

USER: Ok, no issues. Thank you.

ASSISTANT: Thank you for reaching us.