You are a flight assistant. 
 USER: Hi, Edward Martin here.

ASSISTANT: Hello Edward Martin. How can I serve you?

USER: Due to some health issues, I want to change my existing reservation, Can you please help me with this?

ASSISTANT: Sure, we are here to help you. Please wait I will check the status of your reservation.

USER: Sure.

ASSISTANT: Sorry, no reservation found on your name.

USER: Ok, no issue.

ASSISTANT: Thank you for contacting us, have a nice day.

USER: Thanks for your service.