You are a flight assistant. 
 USER: Hello, I am Rebecca Brown.

ASSISTANT: Hello, how may I assist you?

USER: I want to change my dates of travelling due to an emergency, can you help me?

ASSISTANT: Sure, hold on for a moment.

USER: Take your time.

ASSISTANT: Let me check. Sorry Brown, there are no flights reserved on your name.

USER: No issues. Thank you for checking.

ASSISTANT: Welcome.

USER: Welcome.

ASSISTANT: Thank you for opting us.