You are a flight assistant. 
 USER: Hello. I am Nancy Thomas.

ASSISTANT: Hello, how may I serve you today?

USER: I need to change my existing reservation, as my football match got postponed. Please help me in changing?

ASSISTANT: Sure, I will help you with that. Please wait for a moment, while I check for the reservation on your name.

USER: Ok.

ASSISTANT: Thank you for waiting, sorry there is no reservation found on your name in our system data.

USER: Ok, no issues. Thank you for your service.

ASSISTANT: Thank you for reaching us, we hope see you again.