You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, How can I support you?

USER: We friends were planned a trip to visit white house, but one of my friend met with an accident.

ASSISTANT: Ok.

USER: So, I need your help in changing my earlier reservation.

ASSISTANT: Sure, may I know your good name to check the reservation?

USER: I am George Robinson.

ASSISTANT: Please wait a moment.

USER: Ok.

ASSISTANT: We found that no reservation available with your name.

USER: Ok, no issue. Thanks for your response.

ASSISTANT: Thank you for availing us.