You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: Stephen King here.

ASSISTANT: How can I assist you today?

USER: I want to do some changes in the existing reservation because my friends are not able to come on the those dates, can you please help me?

ASSISTANT: Sure. Please wait for a minute, let me check.

USER: Ok.

ASSISTANT: Thank you for waiting, but I have not found any reservation by your name.

USER: That's ok. Thank you for the information.

ASSISTANT: Thank you for contacting us, have a nice day.