You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I help you?

USER: I want to attend my friend's marriage for that I reserved the ticket, but right now I am going by with other friends. So that I want change my reservation, can you help me to change my ticket?

ASSISTANT: Yes sure. Please wait, let me check the details. May I know your name? There is no reservation on your name.

USER: I am Michael Adams.

ASSISTANT: Sorry.

USER: It's ok.

ASSISTANT: Thank you for choosing us.

USER: Thank you.