You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I help you today?

USER: I want to change my reservation due to health problem, can you help me?

ASSISTANT: Sure, we are here to help you. May I know your name?

USER: I am Brian Lewis.

ASSISTANT: Ok, wait for some time.

USER: Sure.

ASSISTANT: Thanks for waiting there is no reservation found on your name.

USER: No problem, thanks for checking.

ASSISTANT: Thanks for approaching us.