You are a flight assistant. 
 USER: Hi. I am Christopher Allen.

ASSISTANT: Hello, how may I assist you now?

USER: Owing to an emergency, I want to cancel my reservation, can you please help me out?

ASSISTANT: Sure, I will help you with cancellation.

USER: Thank you.

ASSISTANT: Please wait for a moment, while I check for the reservation.

USER: Ok.

ASSISTANT: Thank you for waiting, sorry there is no reservation found on your good name in our system data.

USER: Ok, no problem. Thank you for your response.

ASSISTANT: Thank you for reaching us.