You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How can I assist you?

USER: Owing to an emergency I had to request for this change reservation, can you help me in doing that?

ASSISTANT: Sure. May I know your name?

USER: My name is Benjamin Anderson.

ASSISTANT: Please wait a while.

USER: Sure.

ASSISTANT: Thanks for your time.

USER: Ok.

ASSISTANT: We didn't found any reservation by this name.

USER: No problem. Thank you for your information.

ASSISTANT: Thank you for contacting us.