You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I assist you?

USER: I am Amanda Edwards. I am having some important meeting on the date on which I have booked the ticket, can you help me to change my existing reservation?

ASSISTANT: Ok, sure I will assist you.

USER: Thank you.

ASSISTANT: Please wait a moment.

USER: Take your time.

ASSISTANT: Sorry Amanda Edwards, there is no booking done on your name according to our records.

USER: No issues. Thank you for clarifying me.

ASSISTANT: Thank you for choosing our agency. Have a nice day.

USER: You are welcome.