You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How can I assist you?

USER: Please make a reservation with the name of Christopher Williams to LAS.

ASSISTANT: Ok, may I know your travelling dates?

USER: My travelling dates are Jan 11 and Jan 13.

ASSISTANT: Can you please mention your departure airport code?

USER: My departure airport code is IAD.

ASSISTANT: Will you please let me know your depart and arrival timings?

USER: I want to return in the afternoon.

ASSISTANT: May I know your connection limit?

USER: I need a single connecting flight.

ASSISTANT: Ok, please wait for a while.

USER: Sure.

ASSISTANT: Sorry, no flights available on your route.

USER: Ok, no problem. Thank you for the information.

ASSISTANT: Thank you for reaching us.