You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I help you today?

USER: I am Robert Thomas. Owing to an emergency I had to cancel my recent reservation, could you please help me out.

ASSISTANT: Sure. Please wait a minute, so that I will check the availability of existing reservation to cancel it.

USER: Sure.

ASSISTANT: Thank you for waiting, Sorry we found no reservation with your name.

USER: Thanks for your assistance.

ASSISTANT: Thank you for reaching us, Have a great day.