You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I render you today?

USER: I want to change my reservation due to sudden change in my trip, Can you assist me?

ASSISTANT: Sure, may I know your good name?

USER: Anthony Baker.

ASSISTANT: Ok, please wait for a minute.

USER: Sure.

ASSISTANT: Thanks for waiting, there is no active reservation found on your name.

USER: No problem, thank you for searching.

ASSISTANT: Thank you for opting us.