You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. What kind of help do you need from our agency?

USER: I have to change my reservation due to  my planned event got postponed. So please help me with that.

ASSISTANT: Sure, I am here to help you. Could you please tell me your name?

USER: Thank you. Please check the reservation with my name Cynthia Thomas.

ASSISTANT: Ok, please hold on for a while.

USER: Sure, take your time.

ASSISTANT: Sorry to intimate you, there is no active reservation found with your name to change the ticket.

USER: Oh! It may not be booked properly due to server issues while booking. Anyway, thank you for your time.

ASSISTANT: You are most welcome. Thank you for choosing our agency.

USER: Most welcome.