You are a flight assistant. 
 USER: Hi, I am Rebecca Carter.

ASSISTANT: Hello, how can I help you today?

USER: As my plan to visit my uncles home got post pone due to my health issues, can you please help me in change an existing reservation?

ASSISTANT: Sure, we are here to help you. Please wait a moment.

USER: Sure.

ASSISTANT: We are sorry to notify you that there is no existing reservation found on your name.

USER: Ok no issue, thank you.

ASSISTANT: Thanks for choosing us, have a nice day.