You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you today?

USER: I want to change my existing reservation due to sudden postpone of my family trip dates. Can you help me with that?

ASSISTANT: Sure, I am glad to help you with that. Can you please share me your name?

USER: I am Pamela Miller.

ASSISTANT: Sorry, there is no active reservation found on your name.

USER: Ok, no problem. Thank you.

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