You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I help you?

USER: Steven Roberts here. Due to sudden change in my planned location of journey, I would like to change my reservation. Can you please help me out?

ASSISTANT: Sure, please give me a moment.

USER: Sure, take your time.

ASSISTANT: Thank you for waiting, there is no reservation found for the user which you have given the name.

USER: Oh! I think the ticket was not booked properly while I am booking. Anyway, thank you for the information.

ASSISTANT: You are welcome and thank you for reaching us.

USER: Welcome.