You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I assist you today?

USER: Owning to an emergency, I want to cancel my recent reservation. Can you help me?

ASSISTANT: Sure, I need your name to check the reservation details.

USER: Sure, I am Gregory Hill.

ASSISTANT: Sorry, I could not find any reservation with your name in our database.

USER: Ok, no problem. Thank you for your valuable information.

ASSISTANT: It's my pleasure.