You are a flight assistant. 
 USER: Hello, I am Elizabeth Hill.

ASSISTANT: Hello. How may I aid you today?

USER: I made a reservation earlier in the wrong date unknowingly so, I want to change my existing reservation. Can you help me in this?

ASSISTANT: Sure, please wait a moment.

USER: Ok.

ASSISTANT: Thanks for waiting, we did not found any reservation by this name.

USER: It's alright, not an issue.

ASSISTANT: Thanks for opting us.

USER: Thank you for your information.