You are a flight assistant. 
 USER: Hello, I am Daniel Martinez.

ASSISTANT: Hello, how may I be of your help?

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

ASSISTANT: Ok.

USER: Can you help me in this?

ASSISTANT: Sure, I am here to aid you.

USER: Thank you.

ASSISTANT: Please wait for a moment.

USER: Sure.

ASSISTANT: Sorry, there is no active reservation in your name.

USER: It's ok, not an issue.

ASSISTANT: Thanks for contacting us.

USER: Thank you for your information.