You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hi, How may I help you ?

USER: I am Frank Scott. Can you please check if there is any reservation with my name?

ASSISTANT: Sure, Please give me moment. I will get back to you.

USER: Actually I want to change an existing reservation.

ASSISTANT: OK, Let me check that for you.

USER: Sure.

ASSISTANT: Thank you for being patient, we did not find any reservations with your name.

USER: OK, thank you for your time.

ASSISTANT: Thank you, Have a good day.