You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: Sharon Miller here.

ASSISTANT: How can I help you at this moment?

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

ASSISTANT: Sure, I will help you with that. Please wait a moment.

USER: Sure, I will wait for your response.

ASSISTANT: There is no previous reservation available under your name.

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

ASSISTANT: Thank you for contacting us, have a nice day.