You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How may 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: May I know your name please?

USER: I am Michelle Parker.

ASSISTANT: Sorry, there is no reservation found basis on your details.

USER: Not a problem, thank you.

ASSISTANT: Most welcome.