You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Mary Walker.

ASSISTANT: How can I aid you?

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

ASSISTANT: Sure, we are euphoric to help you.

USER: Thank you. I will wait for your response.

ASSISTANT: Please wait a while.

USER: Sure, take your time.

ASSISTANT: Thank you for waiting, but I am sorry to say that, there is no active reservation found with your name in our database to change it.

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

ASSISTANT: Thank you for opting us.