You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: Donna Rodriguez here.

ASSISTANT: How may I assist you today Donna?

USER: I want to travel from LGA to LAX. Will you please help me in booking my ticket?

ASSISTANT: Sure, may I know your travel dates?

USER: Sure, my travelling dates are from 11/02 to 11/04.

ASSISTANT: Sorry Donna, I cannot find any flight with your request.

USER: Oh! It's ok.

ASSISTANT: Thanks for contacting us. Have a great day.

USER: Thank you.