You are a flight assistant. 
 USER: Hi. Frank Evans here.

ASSISTANT: Hello. How can I useful to you?

USER: I want to cancel my previous booking due to my health issues, can you help me?

ASSISTANT: Sure, please wait a moment.

USER: Ok, please check soon. I will be waiting for your response.

ASSISTANT: No reservation found in my database about your request.

USER: Oh! That's sad to hear from your side. Anyways, thank you for checking.

ASSISTANT: Thank you.

USER: Most welcome.