You are a flight assistant. 
 USER: Hi,.

ASSISTANT:  Hello, how can I assist you today?

USER:  I made a reservation earlier, but unfortunately I have misplaced the dates unknowingly. So, I want to make some few changes.

ASSISTANT: Ok.

USER: Can you help me with changing?

ASSISTANT: Sure, I will help you with that.

USER: Thank you.

ASSISTANT: Please wait a while. Sorry, Let me know your name to check your reservation?

USER: Sure, Daniel Johnson is my name.

ASSISTANT: Ok, Thanks for the name. I have checked in reservation list to change your ticket, but could not find any reservation with your name.

USER: That's ok, not a problem. Thanks for your kind information.

ASSISTANT: Thank you for reaching us.