You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: I am Janet Rodriguez.

ASSISTANT: How can I help you?

USER: Can you help me for changing my existing reservation?

ASSISTANT: Sure. Just a second please.

USER: OK.

ASSISTANT: I am sorry to say no reservation found on your name.

USER: Oh! It's ok, no problem.

ASSISTANT: Thank you for choosing us.

USER: Thank you for your services.