You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I help you?

USER: Please book me a flight ticket from EWR to HOU to meet my family.

ASSISTANT: Sure, I am here to assist you. May I know your travel dates?

USER: I have planned to travel on Jan 11th and return on Jan 13th.

ASSISTANT: Thank you. Please tell us your name.

USER: Virginia Edwards.

ASSISTANT: Ok, please wait for a while. Let me check for the available flights. Sorry, there is no flight available on your preferred travel dates.

USER: Ok, no problem. Thank you.

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