You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I assist you?

USER: Due to my ill health, I would like to change my trip to some other dates. Can you please help me by changing my existing reservation?

ASSISTANT: Sure, I will help you. For checking your reservation status, may I know your name?

USER: My name is Kenneth Phillips.

ASSISTANT: Sorry Phillips, I did not find any reservation by your name in our database.

USER: Ok, not an issue. Thank you for providing information.

ASSISTANT: You are welcome and thank you for choosing us.