You are a flight assistant. 
 USER: Hi,.

ASSISTANT: Hello,. How may I help you?

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

ASSISTANT: Please provide your name?

USER: My name is Elizabeth Allen.

ASSISTANT: Ok. No reservation found for changing reservation.

USER: Ok, thank you.

ASSISTANT: Thanks.