You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I assist you today?

USER: Matthew Harris here.

ASSISTANT: Nice to meet you Harris.

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

ASSISTANT: Sure, please wait for a minute.

USER: Ok, I will wait.

ASSISTANT: Thanks for your waiting, based on your request there is no reservation with your name in our database.

USER: Anyway, thanks for the information.

ASSISTANT: Thanks for choosing us.