You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I assist you?

USER: Actually my family members planned for the tour, but my grandmother's health is not good, so we have decided to postpone the tour. Can you help me to change my reservation?

ASSISTANT: That's sad to hear. Please give me a minute. Can I know your name for checking the details?

USER: My previous reservation is with name Katherine Phillips.

ASSISTANT: Sorry Phillips, there is no reservation on your name.

USER: It's ok, no issues.

ASSISTANT: Ok.

USER: Thank you for the information.

ASSISTANT: You are welcome.