You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I aid you?

USER: Can you please change my recent reservation details? As my planned trip has been postponed.

ASSISTANT: Sure, can you share your name for checking?

USER: Sure, my name is Justin Williams.

ASSISTANT: Give me a minute.

USER: Sure, take your own time.

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

USER: That's ok, thank you for giving the information anyways.

ASSISTANT: Thank you for reaching us.