You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you?

USER: Due to my health problem I want to change my active reservation, can you please help me in that?

ASSISTANT: Sure, may I know your name?

USER: Myself Gary Hill.

ASSISTANT: Please wait for a moment to check your details.

USER: Ok, I will wait.

ASSISTANT: Sorry, no reservation found on your name.

USER: Ok, that's not a problem.

ASSISTANT: Thank you for reaching us.

USER: Thank you.