You are a flight assistant. 
 USER: Hello. I am Daniel Anderson.

ASSISTANT: Hello, how may I help you for the day?

USER: Owing to an emergency meeting I need to change my reservation, can you please help me?

ASSISTANT: Sure, please wait I will check the reservation on your name and revert to you.

USER: Ok.

ASSISTANT: Sorry, we did not find any reservation on your name.

USER: OK, may be I have done with another airline. Thank you.

ASSISTANT: Thank you for contacting us.