You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I assist you?

USER: Myself Charles Baker. Due to some business meeting, I am going to cancel my reservation. Can you please help me for this?

ASSISTANT: Ok. please wait for a while.

USER: Sure, I will wait for your kind response.

ASSISTANT: Sorry, no flights found with your criteria.

USER: Not a big issue, anyway thank you very much for your kind service.

ASSISTANT: Thank you for choosing us.