You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: My name is Sandra Harris.

ASSISTANT: How can I help you today?

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

ASSISTANT: Sure, I am mirthful to help you to cancel your reservation.

USER: Thank you.

ASSISTANT: Please allow me a moment.

USER: Sure, I will wait for your response.

ASSISTANT: I found your reservation and it is successfully cancelled.

USER: That's ok, thank you for checking.

ASSISTANT: Thank you for choosing us.

USER: Welcome.