You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How can I aid you?

USER: I want to change my existing reservation which is done recently due to some health issues, can you please help me in this?

ASSISTANT: Sure, may I know the name to check for the status?

USER: Sure, my name is James King.

ASSISTANT: Please be on hold, I will get back to you in a minute.

USER: Sure, I will wait.

ASSISTANT: Thank you for waiting.

USER: It's my pleasure.

ASSISTANT: Here, there is no active reservation have been found under your name in our records to change it.

USER: Ok, not an issue. Thank you for your service.

ASSISTANT: Thank you for reaching us.