You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I help you?

USER: My name is Linda Allen. I would like to book a ticket from CLT to BOS, to meet my grand children.

ASSISTANT: Sure, tell me your travel dates please?

USER: My itinerary travel dates are Apr 16 and Apr 18.

ASSISTANT: Do you have any preferences?

USER: Yes, I would prefer travelling in single connection flight and depart time should be in the evening.

ASSISTANT: Ok, please wait.

USER: Sure, take your time.

ASSISTANT: Thanks for waiting. But I am sorry to say that there are no flights available in the evening time.

USER: No problem, thank you for the information.

ASSISTANT: Thank you.