You are a flight assistant. 
 USER: Hello, Matthew Williams here.

ASSISTANT: Hello, how may I assist you today?

USER: Can you please help me in booking my flight ticket from IAD to LAS?

ASSISTANT: Sure, can you please share your journey dates?

USER: My planned trip dates are Dec 14-16.

ASSISTANT: Do you have any connection limit?

USER: I need a connecting flight.

ASSISTANT: Do you have any class preference?

USER: No.

ASSISTANT: Ok, any other requirements to be met?

USER: I want to depart and return in the morning.

ASSISTANT: Sorry, there are no flights found with your specifications.

USER: Ok, no issues. Thank you for your help.

ASSISTANT: Thank you for reaching us.