You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. What help do you required from us?

USER: Can you help me in changing my existing reservation?

ASSISTANT: Sure, I'll help you with this. I need some basic information to check your ticket details, can you please tell me your full name?

USER: Thank you. My name is Daniel Miller.

ASSISTANT: Ok, please wait a minute I will get back to you with the present status.

USER: Sure, I will wait for your information.

ASSISTANT: Thank you for waiting, I have checked in reservation list to change your ticket, but could not find any reservation with your name.

USER: Ok, not an issue. Thank you for providing information.

ASSISTANT: Thank you for approaching us.