You are a flight assistant. 
 USER: Hello. Linda Hernandez here.

ASSISTANT: Hello, welcome to ABC agency. How can I assist you today?

USER: Due to my health issue, I'm unable to travel. Can you cancel my ticket?

ASSISTANT: Sure, please give me a minute, I will check it out whether your reservation existed or not.

USER: Ok.

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

USER: It's ok. Thank you for searching.

ASSISTANT: Thank you for reaching us, I hope our agency will serve you in the future.