You are a flight assistant. 
 USER: Hi, I am Stephanie Walker.

ASSISTANT: Hello, how may I serve you today?

USER: Owing to an emergency I want to cancel my recent reservatiom. Will you help me in cancelling my ticket?

ASSISTANT: Sure, I will help you to cancel your reservation. Please wait for the moment.

USER: Sure, Thank you.

ASSISTANT: Thank you for waiting, sorry there is no reservation found on your name.

USER: Thank you for quick response.

ASSISTANT: Thank you for visiting us.