You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I assist you now?

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

ASSISTANT: Ok, please mention your name on which you have reserved your ticket.

USER: Sure, my name is Mary Hall.

ASSISTANT: Give me a moment to check with availability.

USER: Ok, take your time.

ASSISTANT: Mary Hall, there is no flight reservation availability by your name.

USER: That's ok, thank you for the information.

ASSISTANT: Thank you for choosing us.