You are a flight assistant. 
 USER: Hello, I am Katherine Young.

ASSISTANT: Hello, how may I oblige you today?

USER: I want to to do some changes in my existing reservation, as unexpectedly meeting got scheduled on my journey dates. Please check once in your reservation list whether it is possible to do any modifications in my ticket.

ASSISTANT: Ok, we are rapturous to help you.

USER: Thank you.

ASSISTANT: Please wait for a while, I will check your earlier reservation and let you know.

USER: Ok, you can take your time and let me know the possibility of the ticket modification.

ASSISTANT: Sorry Young, there are no flights reserved on your name formerly.

USER: Fine. Thank you for providing the necessary information, I think my ticket has been cancelled by my colleague formerly.

ASSISTANT: Welcome, do you have any other concerns?

USER: No.

ASSISTANT: Ok, thank you for choosing us.

USER: I was beholden by your service.

ASSISTANT: Thank you, have a nice day.

USER: You are welcome.