You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How can I assist you?

USER: I want to change my reservation, can you help me in that?

ASSISTANT: Ok, please can I know your name please to check for the reservation status?

USER: I am Jessica Lewis.

ASSISTANT: Ok, please wait a moment.

USER: Ok.

ASSISTANT: Ok, thank you for waiting. Sorry as per the reservation records there is no flight ticket been found to change.

USER: That's ok, thank you.

ASSISTANT: Thank you for choosing our agency.