You are a flight assistant. 
 USER: Hi,.

ASSISTANT: Hello, how may I serve you?

USER:  I am Larry Smith, can you please cancel my existing reservation?

ASSISTANT: OK, thank you for the information, please wait for a while, let me check and get back to you.

USER: OK.

ASSISTANT: We are very sorry to notify you that there is no reservation.

USER: Thank you.

ASSISTANT: Thanks for connecting with us.