You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I aid you?

USER: I am planning to give a sudden surprise to my parents and trying to book a flight ticket for them. Can you please book me a flight ticket from EWR on 02/20?

ASSISTANT: Sure. Where you want to travel?

USER: Return journey from HOU on 02/22.

ASSISTANT: OK, please wait I will check the availability of flights and revert you. Sorry, there are no flights found on your travel dates.

USER: It's ok.

ASSISTANT: May I know your name please?

USER: My name is Nicholas Rodriguez. Thank you.

ASSISTANT: OK Nicholas Rodriguez, thank you for contacting us.