You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I assist you?

USER: I want to change dates in my existing reservation, can you please help me?

ASSISTANT: Sure, I am here to help you. May I know your name?

USER: Myself Charles Moore.

ASSISTANT: Ok, please wait for a while.

USER: Sure, I will wait.

ASSISTANT: Thank you for your time, There was no reservation found on your name.

USER: No issue, anyway thank you for checking.

ASSISTANT: Thank you for reaching us.