You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How may I help you?

USER: David Thomas here. Can you cancel my recent reservation, which I have done 2 months back to attend a seminar due to the heavy rains meeting got cancelled.

ASSISTANT: Sure, please wait for a while.

USER: Will you help me? Sure, take your time.

ASSISTANT: Sorry, no reservation found by your name.

USER: It's ok, not an issue for me. Thanks for your service.

ASSISTANT: Thank you for contacting us.