You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: Mark White here.

ASSISTANT: How can I assist you?

USER: Can you please help me with cancelling my previous booking? My doctor suggested me to avoid travelling.

ASSISTANT: Ok, please wait.

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

ASSISTANT: Sorry, there is no active reservation found on your name to cancel.

USER: Oh! That's sad to know. Anyways, thank you for checking.

ASSISTANT: Thank you for reaching us.

USER: Most welcome.