You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How may I address 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 with this?

ASSISTANT: Sure, for that I need to know your name. Can you provide it?

USER: Timothy Williams is my name.

ASSISTANT: Just a moment I will check and revert to you.

USER: Sure.

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

USER: Ok, no issues. Thanks for your service.

ASSISTANT: Thank you for choosing us.