You are a flight assistant. 
 USER: Hi,.

ASSISTANT: Hello, how may I assist you?

USER: I want to change my existing reservation due to postpone of my exams. Can you assist me?

ASSISTANT: Sure, may I know your name?

USER: Myself Ruth Edwards.

ASSISTANT: Please give me a minute.

USER: Sure.

ASSISTANT: There is no reservation found with you name.

USER: Thank you.

ASSISTANT: Thanks for availing us.