You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I help you?

USER: Can you change my recent reservation to new travel dates?

ASSISTANT: Sure, can I know your name?

USER: Sure, I am Jessica Nelson.

ASSISTANT: Thank you. Please wait for a while, let me check your reservation status.

USER: Sure.

ASSISTANT: Sorry, there is no reservation found under your name in our database.

USER: That's ok, thank you.

ASSISTANT: You are most welcome.