You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Sandra Green.

ASSISTANT: How may I guide you today?

USER: Owing to an emergency, I want to cancel my recent reservation. Can you help me out?

ASSISTANT: Sure, I will help you with that.

USER: Ok.

ASSISTANT: Please wait for a while.

USER: Take your own time.

ASSISTANT: I am sorry to say that there is no reservation found.

USER: That's ok. Anyways, thank you for your help.

ASSISTANT: Thank you for contacting us.