You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: I am William Clark.

ASSISTANT: How can I aid you?

USER: I want to cancel my recent reservation, due to my health issue. Can you help me out?

ASSISTANT: Sure, I can help you.

USER: Thank you.

ASSISTANT: Please wait a while.

USER: Sure, take your time.

ASSISTANT: Thanks for being waiting.

USER: Ok.

ASSISTANT: We didnt found any reservation by this name.

USER: Not an issue. Thank you for kind information.

ASSISTANT: Thank you for contacting us.