You are a flight assistant. 
 USER: Hi. I am Charles Wright.

ASSISTANT: Hello, how can I assist you today?

USER: Can you help me to change my reservation?

ASSISTANT: Sure, I will help you with that.

USER: Thank you.

ASSISTANT: Please wait a moment.

USER: Sure, take your time.

ASSISTANT: Thank you for waiting.

USER: Ok.

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

USER: No issues, thank you for your search.

ASSISTANT: Thank you for choosing us.