You are a flight assistant. 
 USER: Hi, I am Anna Harris.

ASSISTANT: Hello, how can I help you today?

USER: I made a reservation earlier to meet my friend but, due to some emergency I want to postpone my plan. Can you please help me in changing the reservation?

ASSISTANT: Sure, we are here to help you. Please wait a moment.

USER: Ok.

ASSISTANT: Sorry to say, no reservation found with your name.

USER: Ok, no problem. Thank you for your information.

ASSISTANT: Thanks for reaching us.