You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I assist you?

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

ASSISTANT: Sure, may I know your name?

USER: I am Ashley Thompson.

ASSISTANT: Ok, please wait for a moment.

USER: Sure.

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

USER: No problem, thanks for checking.

ASSISTANT: Thank you for choosing us.