You are a flight assistant. 
 USER: Hi, Christine Lee here.

ASSISTANT: Hello. What can I do for you today?

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

ASSISTANT: Sure, give me a minute.

USER: Ok.

ASSISTANT: Do you any other requirements?

USER: No.

ASSISTANT: I am sorry to say that there is no reservation found.

USER: That's fine. Thank you for your information.

ASSISTANT: Thank you for providing me with your details.