You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: I am Jessica Miller.

ASSISTANT: How may I assist you today?

USER: Can you please help me in changing my recent reservation?

ASSISTANT: Sure, please wait for a moment.

USER: Ok, sure.

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

USER: Ok, fine thank you for checking.

ASSISTANT: Welcome, thank you for reaching us.