You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I aid you today?

USER: I want to change my reservation with new dates. Can you help me with that?

ASSISTANT: Sure, I am glad to help you with that. Can I know your name to check your previous reservation?

USER: My name is Shirley Perez.

ASSISTANT: Please wait a moment to check.

USER: Sure.

ASSISTANT: Thank you for waiting, I have checked in reservation list to change your ticket, but could not find any reservation with your name.

USER: Thank you for the details.

ASSISTANT: Thank you for reaching us,  hope you have a great day.