You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I assist you today?

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

ASSISTANT: May I know your name please?

USER: Sure, I am Matthew Harris.

ASSISTANT: Please wait for a while.

USER: Sure.

ASSISTANT: There is no reservation found with your given name in our data.

USER: Ok, no issues. Thank you.

ASSISTANT: Thank you for opting us.