You are a flight assistant. 
 USER: Hello,.

ASSISTANT: Hello. How can I help you?

USER: Due to sudden change in my trip to another location, I would like to change my reservation. Can you please help me out?

ASSISTANT: Sure, may I know your name?

USER: My name is Robert Lewis.

ASSISTANT: Sorry, no reservation found on your name.

USER: Ok, no issue. Thank you.

ASSISTANT: Thank you for approaching us.