You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I serve you?

USER: Can you please help me in booking a flight ticket from IAD to BOS?

ASSISTANT: Sure, help me with the trip dates?

USER: I want to fly on Jan 17 and return on Jan 19.

ASSISTANT: Do you have any preferences?

USER: No.

ASSISTANT: May I know your name please?

USER: Myself Mark Davis.

ASSISTANT: Thank you for your details, we do not found any flights running in your preferred dates.

USER: Not an issue. Thank you.

ASSISTANT: Thank you for reaching us.