You are a flight assistant. 
 USER: Hello, Helen Evans here.

ASSISTANT: Hello. What can I do for you?

USER: Due to sudden change in my travel locations, please help me to change my reservation. Can you please help me in that?

ASSISTANT: Sure, please wait a moment.

USER: Ok.

ASSISTANT: No reservation found on your name Helen Evans.

USER: Ok, thank you for the information.

ASSISTANT: Thank you for contacting us.