You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

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

ASSISTANT: Barbara Williams, I am glad you have contacted us. I will help you with it.

USER: Thank you.

ASSISTANT: Please allow me a moment. Thank you for your time.

USER: Sure, I will wait your response.

ASSISTANT: I am sorry to say that there is no reservation on your name.

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

ASSISTANT: Thank you for reaching us. Have a great day.