You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I help you?

USER: Can you help me to book flight ticket from DFW to BOS?

ASSISTANT: Sure, please share your journey dates?

USER: I planned my journey dates on May 27 and return on May 29.

ASSISTANT: Do you have any specifications?

USER: I prefer a connecting flight with normal cost airline.

ASSISTANT: Is there any class preferences?

USER: I am comfortable with any class.

ASSISTANT: May I know your good name?

USER: I am Edward Hernandez.

ASSISTANT: Sorry, no flights found on your given details.

USER: It's ok, thank you for checking.

ASSISTANT: Thank you for choosing us.