You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I guide you today?

USER: Can you please help me with booking a flight ticket from DEN to BOS?

ASSISTANT: Sure, when do you want to start and return on?

USER: My travel dates are Sept 10 and 12.

ASSISTANT: Do you need a connecting flight?

USER: I need a direct flight.

ASSISTANT: Do you have any specifications?

USER: I would like to return at morning.

ASSISTANT: Can I know your good name?

USER: My name is Christine Thomas.

ASSISTANT: Thank you for your details, there are no flights fond with the given details.

USER: Ok, no issues. Thank you.

ASSISTANT: Thank you.