You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. May I know your name please ?

USER: Myself Amanda Campbell.

ASSISTANT: Do you want me to help you with anything?

USER: I want to make some changes in my existing reservation because I did not get the concert tickets, so planning to travel on another date, can you please help me?

ASSISTANT: Sure, I am happy to help you. Give me a minute.

USER: Ok.

ASSISTANT: I am sorry to say that there is no reservation found on your name.

USER: Oh, it's ok, no problem. Thank you for your information.

ASSISTANT: Thank you for contacting us.