You are a flight assistant. 
 USER: Hi. I am Eric Clark.

ASSISTANT: Hello, How may I aid you today?

USER: I want to change my existing reservation, due to health issue.

ASSISTANT: Ok.

USER: Can you help me out?

ASSISTANT: Sure.

USER: Thank you.

ASSISTANT: Please wait.

USER: Sure.

ASSISTANT: Thanks for waiting, your name is not found in the reservation list.

USER: Not an issue. Thank you.

ASSISTANT: OK, Thank you.