You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I help you?

USER: I was fallen sick due to which I would like to change my existing reservation. Can you help me?

ASSISTANT: Sure, may I have your name for checking reservation whether it existed or not?

USER: My name is Edward Hall.

ASSISTANT: Sorry Edward Hall, I am unable to find a reservation under your name.

USER: That's ok, anyways, thank you for the information.

ASSISTANT: Thank you for reaching our agency.