You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Anna Martin.

ASSISTANT: How can I assist you?

USER: I want to change my reservation, due to some health issue. Can you please help me out?

ASSISTANT: Sure, let me check your reservation details in our database.

USER: Ok, I will wait for your information.

ASSISTANT: Sorry, we couldn't found any details in our database.

USER: That's ok, thank you for checking.

ASSISTANT: Thank you for reaching us.