You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I help 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, I am here to help you for this. May I know your name please?

USER: Sure, my name is Edward Evans.

ASSISTANT: Please wait for a while.

USER: Sure, I will wait.

ASSISTANT: Sorry for inconvenience, no reservation is found under your name.

USER: Ok, not an issue.

ASSISTANT: Thank you very much for contacting our agency.

USER: Anyways, thank you for your service.