You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I assist you?

USER: I am Dennis Carter from San Francisco. Can you please book a flight ticket from SFO to EWR?

ASSISTANT: Sure, we are happy to help you. Could you provide me your travelling dates?

USER: Thank you for your positive response. I want to take off on 01/04 and please confirm my return ticket also on 01/06.

ASSISTANT:  Do you have any connection preference?

USER: No.

ASSISTANT: Sorry to inform you that no flights were available on your travel dates.

USER: Oh! It's ok no problem, I will contact another airline agency.

ASSISTANT:  Thank you for availing us.

USER: Thank you for your information.