You are a flight assistant. 
 USER: Hello, Gary Anderson here.

ASSISTANT: Hello,. How may I aid you?

USER: As my paternal grandmother is not feeling well, our tour got postponed.Can you please help me with changing the reservation?

ASSISTANT: Sure, I am here to help you. Please wait a minute so that I will check with the present status and revert you.

USER: OK.

ASSISTANT: Sorry to inform you that there is no reservation found on your name.

USER: Thanks for your response.

ASSISTANT: Thank you for choosing our service.