You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: Myself Betty Lewis.

ASSISTANT: How can I help you?

USER: Can you please help me in changing my reservation?

ASSISTANT: Sure, may I know your name for finding your reservation?

USER: I have already mentioned in the begging. Please check it.

ASSISTANT: I am sorry Mr. Betty Lewis no reservation found on your name.

USER: It's ok. Thank you for the information.

ASSISTANT: I think your reservation is not confirmed. Thank you for reacting us.