You are a flight assistant. 
 USER: Hi, I am Amy Gonzalez.

ASSISTANT: Hello, how may I serve you today?

USER: As I am not issued with leave during my journey time, so I want to change my existing reservation. Can you help me with it?

ASSISTANT: Sure, I will help you to change your reservation. Please wait for a moment, while I search for the reservation.

USER: Sure.

ASSISTANT: Thank you for waiting, sorry there is no any reservation found on your name in our data base.

USER: That's ok, thank you for the response.

ASSISTANT: Thank you for visiting us, have a nice day ahead.