You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How may I assist you?

USER: Please help me to change an existing reservation as my plan to meet my grand parents got postpone due to my health issues.

ASSISTANT: Sure, please tell your name?

USER: I am Brenda Parker.

ASSISTANT: Sorry, no reservation found on your name for change.

USER: Ok, not an issue.

ASSISTANT: Thank you.

USER: Thank you for your information.