You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I assist you today?

USER: I have planned to change my reservation due to sudden change in my trip, can you assist me?

ASSISTANT: Sure, I will help you with that. Can you please share your name?

USER: Edward Hernandez.

ASSISTANT: I am sorry to inform that there is no reservation found under your name.

USER: No problem, thank you for searching.

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