You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: I am Anna Baker.

ASSISTANT: How can I aid you Baker?

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 Anna Baker, please wait for  a couple of minutes.

USER: Sure.

ASSISTANT: Sorry Anna , no reservation done on your name.

USER: Ok, no issues. Thanks for your assistance.

ASSISTANT: Thank you for choosing us.