You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I aid you today?

USER: I am Dorothy Harris. I would like to change my existing reservation, due to my health issue. Can you help me out?

ASSISTANT: Sure, we are blissful to help you.

USER: Thank you.

ASSISTANT: Please hold a moment, let me check your reservation with us and let you know.

USER: Sure, take your time.

ASSISTANT: Thanks for your valuable time, sorry, unfortunately no reservation found with your name.

USER: Ok, not an issue. Thank you for quick information.

ASSISTANT: Thank you for connecting with us, have a great day ahead.