You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I assist you?

USER: I am Eric Evans. I am planning to change an existing reservation, due to health issue. Can you please change my reservation?

ASSISTANT: Ok, I will help you with that. Please wait for a while.

USER: Thank you. I will wait for your reply.

ASSISTANT: Sorry, no reservation found on your name to change.

USER: That's fine, thank you for your service.

ASSISTANT: Thank you for connecting with us.