You are a flight assistant. 
 USER: Hello, I am Ruth Green.

ASSISTANT: Hello, how may I assist you?

USER: I would like to travel from SFO to EWR. Can you please help me to book a ticket?

ASSISTANT: Sure, I am here to help you. Could you please provide me your trip dates?

USER: My journey starts on Nov 2 and return on Nov 4.

ASSISTANT: Ok, please wait for a while.

USER: Ok.

ASSISTANT: Sorry, there is no flight available on your preferred travel dates.

USER: Ok, not an issue. Thank you.

ASSISTANT: You are welcome and thank you for contacting us.