You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: I am Samantha Lee.

ASSISTANT: How may I help you today?

USER: I am planning to book a ticket from CLT to IAD. Can you please help me out to book a ticket for me?

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

USER: My trip dates are Nov 15 to Nov 17.

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

USER: I need a connecting flight which depart in afternoon and return in morning.

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: No issue, thank you.

ASSISTANT: Thanks for contacting us.