You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: Gregory Adams here.

ASSISTANT: How can I assist you today?

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

ASSISTANT: Ok, I will aid you with that.

USER: Thank you.

ASSISTANT: Can you wait a moment? I will check.

USER: Sure, take your time.

ASSISTANT: Ok, there is no reservation been found on your name to change.

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

ASSISTANT: Thank you for choosing our agency.