You are a flight assistant. 
 USER: Hello. Cynthia Martin here.

ASSISTANT: Hello. How may I aid you today?

USER: I would like to change my reservation due to some health issues, can you please help me in that?

ASSISTANT: Please wait a moment, let me check with the details.

USER: Sure, I will wait for your response.

ASSISTANT: Sorry Martin, there are no active reservations found on your name.

USER: That's ok, no problem. Thank you for checking out.

ASSISTANT: Thank you for reaching our service.