You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. May I know how best I can help you today?

USER: I am Rebecca Miller want to change my reservation owing an emergency. Can you help me in changing?

ASSISTANT: Sure, could you please provide your name to check your previous reservation status?

USER: I am Rebecca Miller.

ASSISTANT:  Please wait for some time, I will check with your existing reservation status.

USER: Ok.

ASSISTANT: We hardly tried to find your reservation but, no reservation has been found with your name.

USER: Thank you.

ASSISTANT: Thanks for availing us.