You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I aid you today from my end?

USER: Can you help me to change my reservation please?

ASSISTANT: Sure, I am here solve your concern in modifying the reservation. Please provide me your name to check the reservation status on your name in our database.

USER: I am David Phillips.

ASSISTANT: Please allow me a moment to fetch the reservation status.

USER: Sure, take your time.

ASSISTANT: Sorry David Phillips, I got a result by fetching your name in reservation changing panel that is " No reservation Found for this user".

USER: That's ok, thank you for checking.

ASSISTANT: Thank you for reaching us.