You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I help you?

USER: I am Kathleen Harris. I am planning to change my existing reservation, due to health issue.

ASSISTANT: Ok, please wait a moment I revert you back with the preferable information.

USER: Can you please change my ticket? Sure.

ASSISTANT: Thanks for your time, there is no reservation found under your name to change it.

USER: That' s fine. Thank you for your service.

ASSISTANT: My pleasure.