You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: I am Charles Smith.

ASSISTANT: How may I assist you today Smith?

USER: Will you assist me in changing my reservation as my plan to go for a film festival got postponed?

ASSISTANT: Sure, I am oblige to help you with that.

USER: Thank you.

ASSISTANT: Please wait a moment to check your previous reservation status.

USER: Sure.

ASSISTANT: We regret to inform you that, there is no reservation on your name in our records.

USER: Not an issue. Thank you for your response.

ASSISTANT: Thank you for reaching us, have a great day.