You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How may I help you?

USER: Can you help me in booking from IAD to EWR, as there is a conference meeting to attend?

ASSISTANT: Can you help me with your dates?

USER: My trip dates are Dec 12-14.

ASSISTANT: Do you need any connections?

USER: I am looking for a stopover flight.

ASSISTANT: Are there any other preferences?

USER: I am comfortable in a economy class.

ASSISTANT: May I know your name?

USER: I am Ryan Collins.

ASSISTANT: Sorry, there is no flight found with your details.

USER: No issue, thank you.

ASSISTANT: Thank you for reaching us.