You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I render you?

USER: I would like to change my existing reservation due to postpone of my seminar. Can you please help me?

ASSISTANT: Sure, I can help you. May I know your name?

USER: I am Richard Baker.

ASSISTANT: Please give me a moment to check your ticket status.

USER: Sure.

ASSISTANT: Sorry Richard Baker, no reservation is available by your name.

USER: No problem, thank you for the information.

ASSISTANT: Thank you for approaching us.