You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I aid you today?

USER: I want to change my existing reservation due to sudden postpone of my family trip dates. Can you help me with that?

ASSISTANT: Sure, we are here to help you.

USER: Thank you.

ASSISTANT: Can I have your name to proceed further?

USER: Sure, Katherine Moore here.

ASSISTANT: Please wait a minute.

USER: Sure.

ASSISTANT: Thank you for your valuable time, sorry, no reservation found on your name.

USER: Ok, no worries at all.

ASSISTANT: Thank you for approaching us.

USER: Thank you for your kind information.