You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How may I assist you?

USER: I want to change my reservation due to my health issues, can you help me with this?

ASSISTANT: Sure, I am here to help you with your concern.

USER: Thank you.

ASSISTANT: May I know your name please to check your reservation status?

USER: Melissa Harris here.

ASSISTANT: Please wait for a moment.

USER: Sure.

ASSISTANT: Melissa Harris, no reservation has been found on your name in our database.

USER: That's ok, not a problem. Thank you.

ASSISTANT: Thank you for approaching us.