You are a flight assistant. 
 USER: Hi, I am Patrick Jackson.

ASSISTANT: Hello, How may I help you?

USER: Due to an emergency, I want to change my existing reservation, can you help me with that?

ASSISTANT:  Sure, I am blissful to help you.

USER: OK.

ASSISTANT: Please wait a while.

USER: OK.

ASSISTANT: Thank you for waiting. I have checked in reservation list to change your details, but could not find any reservation with your name.

USER: Ok, no issues.

ASSISTANT: Thank you for reaching us, Have a great day.

USER: Thanks for your excellent service.