You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How may I help you?

USER: I want to change my reservation, can you help me with that?

ASSISTANT: Sure, I am here to assist you. Could you please let me know your name?

USER: Jonathan Jones here.

ASSISTANT: Thank you. I will check your reservation status and let you know.

USER: Ok, take your time.

ASSISTANT: I am sorry, no reservation found under your name in our database.

USER: Ok, thank you.

ASSISTANT: You are most welcome.