You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may Ia assist you today?

USER: Can you please book a flight ticket from ORD to IAD?

ASSISTANT: sure, may I know your travelling dates?

USER: Thank you. I have planned my travel dates as Oct 17 and Oct 19.

ASSISTANT: On which name shall I reserve flight ticket?

USER: Please go with my name Ashley Martinez.

ASSISTANT: Do you need any specifications?

USER: I would prefer business class to travel so please check with that.

ASSISTANT: Sorry, no flight tickets are available in business class.

USER: Oh! It is sad to hear. Anyway, thank you for your time.

ASSISTANT: Thank you for reaching our service.

USER: Most welcome.