You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I oblige you today?

USER: Could you please book me a ticket from EWR to HOU on the name Nicholas WIlliams.

ASSISTANT: Sure, could you please let me know your travel dates?

USER: My travelling dates are from 07/31 to 08/01.

ASSISTANT: Do you have any specifications?

USER: My budget is 200.

ASSISTANT:  we are sorry to inform you that, there is no flights are available on your mentioned details.

USER: Fine, thanks for the information.

ASSISTANT: Thank you for availing us.