You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: I am Larry Gonzalez.

ASSISTANT: How may I help you today?

USER: I am planning to travel from DEN to BOS, help me in booking a flight?

ASSISTANT: Sure, let me know your travel dates please?

USER: My travelling dates 12/06 to 12/08.

ASSISTANT: Do you have any specific depart and arrival timings?

USER: I will return on morning.

ASSISTANT: May I know your connection limit?

USER: I need 1 connection.

ASSISTANT: Ok, is there any class preference?

USER: No.

ASSISTANT: Do you have any airline preference?

USER: No.

ASSISTANT: Sorry to inform you that there are no flight services available on your given dates.

USER: That's fine, thank you for your service.

ASSISTANT: Thanks for contacting us.