You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Ruth Davis.

ASSISTANT: How can I assist you?

USER: Actually, I made a booking last week. But, now I want to cancel that reservation. Will you please help me?

ASSISTANT: Sure. Give me a minute?

USER: Ok.

ASSISTANT: Sorry to inform that there is no reservation found.

USER: It's ok, thank you for your service.

ASSISTANT: Thank you for contacting us.

USER: You are welcome.