You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how could I aid you?

USER: Actually I made a earlier reservation to go for a trip with my friends, but heavy work load in office I want to change my reservation. Can You help me to change an existing reservation?

ASSISTANT: Sure, let me know your good name to proceed further.

USER: I made a reservation by this name Jessica Gonzalez.

ASSISTANT: Give me sometime.

USER: Ok.

ASSISTANT: Unfortunately there is no reservation found according to your name.

USER: Ok, not an issue. Thanks for your information.

ASSISTANT: Thank you for availing us.