You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I aid you?

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

ASSISTANT: Sure, please let me know your name to check for the reservation status is active or not.

USER: Sure, myself Michael Collins.

ASSISTANT: Please be on hold, I will get back to you in couple of minutes.

USER: Sure, I will wait for your response.

ASSISTANT: Thank you for waiting. Sorry to say, there is no active reservation have been found under your name in our database to amend it.

USER: Ok, no issues. Thank you for checking out.

ASSISTANT: Thank you for reaching us.