You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I provide service to you?

USER:  I am Jeffrey Phillips.

ASSISTANT: Ok.

USER: Can you please change my existing reservation as my plan to meet my friend got postponed?

ASSISTANT: Sure, I will help you with that.

USER: Thank you.

ASSISTANT: Please wait for a couple of minutes.

USER: Sure.

ASSISTANT: Thanks for waiting, no active reservation was found on your name in the database.

USER: It's ok, thank you for the information.

ASSISTANT: Thank you for reaching us.