You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I assist you?

USER: I am Frank Campbell. I need to change my reservation due to my planned event got postponed. So please help me with changing my reservation.

ASSISTANT: Sure, I will help you.

USER: Thank you for that.

ASSISTANT: Please wait a moment.

USER: Sure, I will wait for your response.

ASSISTANT: Sorry, there is no reservation on your name.

USER: Oh! It may not booked properly due to server issues while booking.

ASSISTANT: Thank you.

USER: Anyway, thank you for your time.