You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you today?

USER: I want to change my existing reservation as my plan to go for trekking got postponed. Can you help me in changing the reservation made on name Susan Moore?

ASSISTANT: Sure, I will help you in changing your reservation. Please wait for a while.

USER: Ok.

ASSISTANT: Sorry Moore, no reservation found on your name.

USER: That's Ok.

ASSISTANT: Thank you for approaching us.

USER: Thanks for your information.