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

ASSISTANT: Hello Rebecca, what can I do for you today?

USER: I planned a holiday vacation. But, due to some emergency I want to change an existing reservation.

ASSISTANT: Ok. Hold on a moment.

USER: Sure.

ASSISTANT: Rebecca, no ticket found as per your name to update.

USER: Ok. Not an issue.

ASSISTANT: Thank you for contacting us.

USER: Thank you for your quick response.