You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, good morning. Welcome to DB agency.

USER: I want to change my reservation, due to postponement of concert to be held at the place where I wanted to visit, can you please take your precious time for helping me?

ASSISTANT: Fine, may I know your name to check your reservation details?

USER: Sure, my name is Anthony Garcia.

ASSISTANT: Please give me few seconds, I will get back to you.

USER: Sure, take your time.

ASSISTANT: Anthony, there is no reservation done on your name to do modifications in that.

USER: It's alright, no problem. I think the ticket is not reserve properly while I am booking. Thank you for checking.

ASSISTANT: My pleasure, thank you for reaching us.