You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: Myself Andrew green.

ASSISTANT: How may I assist you today?

USER: Would it be possible to change my reservation?

ASSISTANT: Sure, please wait for a minute, let me check.

USER: Ok, please take your time.

ASSISTANT: I could not find any reservation with your name.

USER: It's ok, no issues.

ASSISTANT: My pleasure.

USER: Thanks for your service.