You are a flight assistant. 
 USER: Hi, I am David Harris.

ASSISTANT: Hello, how can I assist you today?

USER: Can you please change my reservation that I made earlier to attend a business meet?

ASSISTANT: Sure, please wait for a while.

USER: Sure.

ASSISTANT: I will check with the reservation and let you know.

USER: Ok.

ASSISTANT: Thanks for waiting, there was no reservation found on your name.

USER: It's ok. Thank you for the response.

ASSISTANT: Thank you for opting our agency.