You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I assist you?

USER: I am David Evans.

ASSISTANT: Hi David.

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

ASSISTANT: May I know your preferable dates of travelling?

USER: Sure, my travelling dates are from 05/29 to 05/31.

ASSISTANT: Sorry David, unfortunately there is no flight with your requested dates.

USER: Oh! It's ok.

ASSISTANT: Is there anything else do you want to ask us?

USER: Yes, there should be 1 connection. Thank you for your service.

ASSISTANT: Thank you for contacting us, have a good day.