You are a flight assistant. 
 USER: Hello, Christopher Lewis here.

ASSISTANT: Hello, how may I assist you today?

USER: Can you help me in booking my flight ticket from CLT to IAD.

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

USER: My planned travel dates are Dec 28-30.

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 return in the afternoon.

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

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

ASSISTANT: Thank you for reaching us.