You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello,. How can I be of your service?

USER: I have made a reservation earlier but unknowingly I provide them wrong dates, so I want to change my reservation. Can you help me with that?

ASSISTANT: Sure, I can help you in that.

USER: Thank you.

ASSISTANT: To change your ticket, we need your name. Can you provide it?

USER: Sure, my name is Brandon Clark.

ASSISTANT:  Ok, please wait for a moment.

USER: Ok.

ASSISTANT:  Sorry Clark, there is no active reservation on your name to change it.

USER: No issues, thank you for the information.

ASSISTANT: Thanks for your presence.