You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you?

USER: I want to change my existing reservation due to bad health issues. Can you help me with that?

ASSISTANT: Sure, I am here to assist you.

USER: Thank you.

ASSISTANT: Ok, please provide your name.

USER: I am Eric Robinson.

ASSISTANT: Ok, please wait for a while.

USER: Sure.

ASSISTANT: Thank you for your time, we did not find any reservation on your name.

USER: Ok, no problem. Thank you for your information.

ASSISTANT: Thank you for opting us.