You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I assist you today?

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

ASSISTANT: Sure, we will aid you out. let me know your name to track your details.

USER: Reservation was done by the name Charles Davis.

ASSISTANT: Ok, please be on hold.

USER: Ok.

ASSISTANT: Thanks for being on hold, no reservation was found based on your name.

USER: Fine, thanks for the information.

ASSISTANT: Thank you for opting us.