You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I aid you today?

USER: Due to some health issues, I would like to change my existing reservation. Please help me out.

ASSISTANT: Sure, we are here to help you.

USER: Thank you.

ASSISTANT: Can I have your name to proceed further?

USER: My name is Jerry Carter.

ASSISTANT: Ok, please wait a moment, let me check your reservation.

USER: Sure, take your time.

ASSISTANT: Thank you for your valuable time, sorry no reservation found with your name.

USER: Ok, no problem. Thank you for your information.

ASSISTANT: Thank you for availing us.