You are a flight assistant. 
 USER: Hi,.

ASSISTANT: Hello.

USER: I am Sarah Edwards.

ASSISTANT: How may I serve you?

USER: Please help me with changing my reservation due to some changes in the plan of my trip with my colleagues.

ASSISTANT: Sure. Please wait.

USER: Sure.

ASSISTANT: Thanks for waiting.

USER: Ok.

ASSISTANT: No reservation found on your name.

USER: Ok, not a problem. Thank you for your information.

ASSISTANT: Thank you.