You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How may I be of your assistance?

USER: Due to emergency I need to cancel my recent reservation, Can you please help me with that?

ASSISTANT: Sure, I'll help you in cancellation.

USER: Thank you.

ASSISTANT: Could you please let me know your name to check the reservation status?

USER: Donald Clark here.

ASSISTANT: Thank you for providing your name , please wait a while.

USER: Sue, I will wait for your response.

ASSISTANT: Thank you for waiting. Sorry, there is no active reservation have been found under your name in our database to cancel it.

USER: Ok, no problem. Thanks for your information.

ASSISTANT: Thank you for approaching us.