You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How may I assist you?

USER: I am Dorothy Jones.

ASSISTANT: Thank you for providing your name.

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

ASSISTANT: Ok.

USER: Can you help me out?

ASSISTANT: Sure.

USER: Thank you.

ASSISTANT: Wait a minute.

USER: Ok.

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

USER: Not a problem.

ASSISTANT: Thank you.

USER: Thank you for your information.