You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How can I assist you today?

USER: My trip was postponed and I want to change my reservation, can you help me?

ASSISTANT: Sure, will you provide your name?

USER: My name is Janet Carter.

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

USER: Not a problem. Thank you for checking.

ASSISTANT: Welcome, have a great day.