You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I help you today?

USER: I am Rachel  Lewis  here. Due to the inconvenience of travelling dates, I need to cancel my existing reservation. Can you please help me out?

ASSISTANT: Sure, I will help you with that. Please wait for a moment.

USER: Thank you for considering my request.

ASSISTANT: Sorry Lewis, no reservation found under your name.

USER: Not a big problem, anyway thank you for the information.

ASSISTANT: Thank you for reaching us.

USER: Thank you for your service.