You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I assist you right now?

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

ASSISTANT: Sure, I am glad to help you with that. Can you please provide your name to check your previous reservation?

USER: Thank you. Myself David Clark.

ASSISTANT: Please wait a moment.

USER: Sure, take your time.

ASSISTANT: There is no reservation found on your name in our records.

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

ASSISTANT: Thank you for reaching us, hope you have a great day.

USER: Anyway, thank you for your time.

ASSISTANT: Welcome.