You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: Gary Smith here.

ASSISTANT: How may I assist you today?

USER: Due to emergency, I want to cancel my reservation. Can you please help me for that?

ASSISTANT: Sure, I am glad to help you with that. Please wait a moment to check your previous reservation.

USER: Ok.

ASSISTANT: We regret that, there is no reservation with your name in our records.

USER: Thanks for the information.

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