You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I help you today?

USER: I am planning to visit Houston, can you please book me a ticket from EWR to HOU?

ASSISTANT: Please share your travel dates.

USER: My preferable journey dates are from 02/18 to 02/20.

ASSISTANT: Please wait a moment.

USER: Sure.

ASSISTANT: Sorry, no flights are available on your route.

USER: Ok, not an issue.

ASSISTANT: Ok. May I know your name?

USER: My name is Stephen Young.

ASSISTANT: Thank you for reaching us.

USER: Thank you for providing information.