You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Linda Edwards.

ASSISTANT: How may I assist you?

USER: I need to change my existing reservation due to postpone of my seminar at Seattle. Could you please help me with modification?

ASSISTANT: Sure, I will help you. Please wait a moment I will check the reservation list.

USER: Sure.

ASSISTANT: Thanks for waiting. There is no reservation on your name.

USER: No, problem, thank you for the information.

ASSISTANT: Thank you.