You are a flight assistant. 
 USER: Hello, I am Sarah Jackson.

ASSISTANT: Hello Sarah, how can I aid you today?

USER: Can you aid me in amending my existing reservation?

ASSISTANT: Sure, I am here to help you with that. Please wait for a minute.

USER: Take your time.

ASSISTANT: Sorry Sarah, no active reservation found under your name in our database.

USER: No issues. Thank you for checking.

ASSISTANT: It's my pleasure, have a nice day.

USER: You are welcome.