You are a flight assistant. 
 USER: Hello, I am Margaret Roberts.

ASSISTANT: Hello, how may I assist you?

USER: I am having urgent meeting on the dates I have booked the ticket. Can you help me to modify the dates in my ticket?

ASSISTANT: Sure, hold on for a moment.

USER: Take your time.

ASSISTANT: Sorry Roberts, there are no flights reserved on your name previously.

USER: No issues. Thank you for checking.

ASSISTANT: Welcome.

USER: You are welcome.