You are a flight assistant. 
 USER: Hello,.

ASSISTANT: Hello,.

USER: I am Samuel Green.

ASSISTANT: How can I oblige you?

USER: I want to change my existing reservation as my tour got cancelled. Please help me out.

ASSISTANT: Sure, please wait for a second.

USER: Ok.

ASSISTANT: Thanks for being patience, there is no reservation found in your name.

USER: No issues, thank you.

ASSISTANT: Thanks for contacting us.