You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: My name is Brenda Hall.

ASSISTANT: How can I provide assistance to you today?

USER: My business trip is postponed, so I have decided to change my dates in previous ticket which is booked in the last month. Can you help me in changing my travel dates in the ticket?

ASSISTANT: Sure, I will help you to modify your reservation.

USER: Thank you.

ASSISTANT: Let me check the current status and revert you back.

USER: Sure. I will wait for your response.

ASSISTANT: Sorry to say this, I didn't find any reservation on your name.

USER: Not an issue, thank you for checking.

ASSISTANT: Thank you for availing us. Have a nice day.