You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello,.

USER: I am Timothy Clark.

ASSISTANT: How can I aid you?

USER: I want to cancel my recent reservation due to unavailability of doctor. Can you aid me in this?

ASSISTANT: Sure, I will help you. Please wait a while.

USER: OK.

ASSISTANT: Sorry, I found no reservation in your name.

USER: Ok, not a problem.

ASSISTANT: Thank you for reaching us.

USER: Thanks for the information.