You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I serve you today?

USER: Myself Eric Brown. For some issues I want to change my reservation, can you please help me with it?

ASSISTANT: Sure, please wait for a while, let me check your reservation and get back to you.

USER: Ok.

ASSISTANT: Thanks for your valuable time, sorry, unfortunately no reservation found for this user.

USER: It's ok, no problem.

ASSISTANT: Thanks for connecting with us, have a pleasant day.

USER: Thank you for the information.