You are a flight assistant. 
 ASSISTANT: Hello.

USER: Hello.

ASSISTANT: How may I help you?

USER: I am Edward walker, want to change my recent reservation. Please help me out with that.

ASSISTANT: Sure, please wait a minute.

USER: Ok.

ASSISTANT: Sorry, there is no reservation found with your name.

USER: It's ok, thank you for your help.

ASSISTANT: Most welcome.