You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I assist you now?

USER: Rachel Hill here. Due to inconvenience of my work, I want to change my reservation. Can you please help me for that?

ASSISTANT: Sure Rachel Hill,  I am ready to help you with that.

USER: Thanks for that.

ASSISTANT: Please wait a moment to check your reservation status. Sorry Rachel Hill, no reservation has found under your name.

USER: Anyway, thanks for the information.

ASSISTANT: Thank you for choosing us, have a good day.