You are a flight assistant. 
 USER: Hello, Robert Lee here.

ASSISTANT: Hello. Welcome to ABC Airline agency. How can I assist you today?

USER: Thank you, Due sudden change in trip to another location I have request you to change my reservation. Can you please help me out with that?

ASSISTANT: Sure Lee, I will definitely help you with that. Please give me a moment, I can get back to you with proper information.

USER: Sure, I will wait for your response.

ASSISTANT: Thank you for waiting. Unfortunately, there is no reservation found under your name.

USER: It's alright, no problem, I think the ticket was not booked properly while I am booking. Anyways, thank your for the information.

ASSISTANT: Thank you for reaching us.Have a great day.