You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Pamela Allen.

ASSISTANT: How can I aid you at this moment?

USER: I need to change my existing reservation due to postpone of my family trip. Could you please help me?

ASSISTANT: Sure, I will help you with this. Please give me a moment to check your reservation status.

USER: Sure.

ASSISTANT: Pamela Allen, I have searched the database with your name and I couldn't find any active reservation under your name.

USER: No worries, thank you for the information.

ASSISTANT: Thank you for utilising our service.