You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I assist you today?

USER: As I am sick, I want to change my reservation.

ASSISTANT: Sure, I will help you on that. Please mention the name for checking the reservation.

USER: My name is Thomas Adams.

ASSISTANT: Please give me a moment.

USER: sure.

ASSISTANT: Thank you for waiting, there is no reservation found under your name.

USER: It's ok, thank you.

ASSISTANT: Welcome, have a great day.