You are a flight assistant. 
 USER: Hello, Jessica Jackson.

ASSISTANT: Hello, Jessica. How can I assist you today?

USER: I want to change my existing reservation, due to I made a reservation earlier on a wrong date. Can you assist me with that?

ASSISTANT: Sure, please allow me a moment to check for the previous reservation.

USER: Sure.

ASSISTANT: Jessica, there is no reservation found under your name.

USER: Ok, thanks for your help.

ASSISTANT: You are welcome. Thank you for contacting us.