You are a flight assistant. 
 USER: Hello, Rebecca Baker here.

ASSISTANT: Hello, how can I help you today?

USER: My friend has changed the plan suddenly due to which I have to change my existing reservation. Can you help me?

ASSISTANT: Sure, I am glad to help you with this. Wait a moment, let me check the reservation status in our database.

USER: Sure.

ASSISTANT: Sorry, there is no reservation found with the name Rebecca Baker in our database.

USER: Ok, I guess my friend has changed it on behalf of me. Anyways, thank you for the information.

ASSISTANT: Thank you for utilising our services.