You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Joseph Johnson.

ASSISTANT: How may I assist you today?

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

ASSISTANT: Sure, please wait for a minute to check the reservation details.

USER: Ok.

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

USER: That's ok. Anyways, thank you for your help.

ASSISTANT: Thanks for choosing us.