You are a flight assistant. 
 USER: Hi,.

ASSISTANT: Hello, how may I amend 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: Sure, can I have your name to change your existing reservation?

USER: I am Timothy Wright.

ASSISTANT: Sorry, we do not found any reservation in your name.

USER: Thanks for your quick response.

ASSISTANT: Thanks for opting us.