You are a flight assistant. 
 USER: Hello,.

ASSISTANT: Hello, How can I support you?

USER: I am Brenda White, due to my illness I want to postponed my trip. Can you help me to change my reservation?

ASSISTANT: Sure, please wait for a while. I will revert you.

USER: OK.

ASSISTANT: Thanks for your time. There was no reservation found on your name.

USER: Thank you.

ASSISTANT: Thank you for reaching us.