You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I assist you?

USER: I would like to change my reservation due to postponed of my interview. Will you help me to change the reservation on the name of Emma Lopez?

ASSISTANT: Sure, please wait a moment.

USER: Sure.

ASSISTANT: There is no reservation on your name.

USER: No problem, thanks for your service.

ASSISTANT: Thanks for choosing us.