You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I assist you?

USER: I want to change my existing reservation due to postpone of my client meeting, so can you help me with this?

ASSISTANT: Sure, please share your name.

USER: My name is Ruth Jones.

ASSISTANT: Please wait for a while.

USER: Sure.

ASSISTANT: We didn't find any reservation on your name to cancel.

USER: Not a problem, thank you.

ASSISTANT: Thank you.