You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I assist you today?

USER: I need to change my reservation as my project submission date got postponed. Can you help me with changing my existing reservation made by name Sharon Moore?

ASSISTANT: Sure, please wait for a minute.

USER: Sure.

ASSISTANT: Sorry, there is no reservation found on your name.

USER: That's alright, thanks for your assistance.

ASSISTANT: Thank you for reaching us.