You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I help you today?

USER: I am planning to change my reservation, can you help me in changing?

ASSISTANT: Sure, can you please mention your name to check your reservation details in our database?

USER: I am Jacob Hill.

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

USER: Ok.

ASSISTANT: Sorry, I did not find any reservation by your name in our database.

USER: That's ok, thank you.

ASSISTANT: Thanks for reaching us.