You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I help you?

USER: I want to change my existing reservation, due to some health issue. Can you help me?

ASSISTANT: Yes, can you tell me your name?

USER: Ok, I am Jessica Adams.

ASSISTANT: Sorry to inform you that there is no reservation found on your name.

USER: Ok, not a problem.

ASSISTANT: Thank you for reaching us.

USER: Thank you for your help.