You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Katherine Lewis.

ASSISTANT: Is there any emergency that I can help you now?

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

ASSISTANT: Sure, I can help you in ticket modification. Please give me a moment.

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

ASSISTANT: Thank you for waiting, there is no reservation found for the user name to modify the flight ticket booking.

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

ASSISTANT: You are most welcome and thank you for your time in reaching us.