You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I oblige you today?

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

ASSISTANT: Sure, may I know your good name?

USER: Thank you. Please check the reservation with my name Kathleen Walker.

ASSISTANT: Ok, please wait for a minute.

USER: Sure, take  your time.

ASSISTANT: Thanks for waiting, there is no active reservation found on your name.

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

ASSISTANT: Thank you for choosing us.

USER: Most welcome.