You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I guide you?

USER: I wanted to change my reservation due to my planned program me got postponed.

ASSISTANT: Sure, can I know your name?

USER: Can you help me is there any chance to change my reservation.

ASSISTANT: Sure.

USER: I am Barbara Thompson.

ASSISTANT: I'm sorry Barbara, there are no reservations with your name.

USER: It's ok, no issues.

ASSISTANT: Thank you, have a good day.

USER: Thank you for your help and valuable information.