You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I oblige you today?

USER: My meeting got postponed as of now, so I need to change my existing reservation. Can you please help me with that?

ASSISTANT: Sure, I will help you with that.

USER: Sure.

ASSISTANT: Please let me know your good name?

USER: My name is Debra Brown.

ASSISTANT: Ok, please wait for a minute.

USER: Sure.

ASSISTANT: Thank you for your precious time.

USER: My pleasure.

ASSISTANT: Sorry, we didn't not find any reservation on your name.

USER: Ok, no issue. may be reservation not done properly. Anyway thank you for your information.

ASSISTANT: Thank you for reaching us.