You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I help you today?

USER: Due to inconvenience of my work, I want to change my reservation. Can you please help me for that?

ASSISTANT: Sure, I will help you with that.

USER: Thanks for that.

ASSISTANT: I need to know your name to check your recent reservation?

USER: My name is Edward Williams.

ASSISTANT: Sorry, no reservation is found on your name in our database.

USER: Anyway, thanks for the information.

ASSISTANT: Thank you for reaching us.