You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Dorothy Evans.

ASSISTANT: Nice to meet you, Dorothy Evans. How may I help you for today?

USER: I want to alter my previous reservation because of some personal issue. Will you please help me with that?

ASSISTANT: Sure, I will help you. Please give me a minute.

USER: Ok, take your time.

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

USER: It's ok, not an issue. Thank you for your help.

ASSISTANT: Most welcome.