You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: I am Raymond Perez.

ASSISTANT: How may I guide you today?

USER: I want to book a ticket from BOS to ORD, can you help me?

ASSISTANT: Sure, I will help you with that. Can you please provide your preferable dates of travelling?

USER: My travel dates are Jan 16 and 18.

ASSISTANT: Do you have any class preference?

USER: No.

ASSISTANT: At what time are you planning to depart and return?

USER: My depart time is in the evening.

ASSISTANT: Do you have any connection limit?

USER: I need a connecting flight.

ASSISTANT: Please be on hold to check the flights on your route.

USER: Sure.

ASSISTANT: We regret to tell you that, there are no flights found on your route with your required specifications.

USER: No problem, thanks for checking.

ASSISTANT: Thank you for reaching us, have a great day.