You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I assist you?

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

ASSISTANT: Sure, may I know your name?

USER: My name is Sarah Clark.

ASSISTANT: Sorry, there is no reservation found on your name.

USER: Ok, no issues. Thank you.

ASSISTANT: Thank you for choosing us.