You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: Myself Jerry Miller.

ASSISTANT: Jerry, how can I assist you?

USER: I would like to cancel my existing  reservation. can you help me?

ASSISTANT: Sure, I am here to help you. Please wait for a while, I will check your reservation status and get back to you.

USER: Sure, I will wait.

ASSISTANT: Jerry, I have not found any reservation by your name in our database.

USER: That's fine, no problem. Thank you for searching.

ASSISTANT: You are welcome and thank you for choosing us.