You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I aid you today?

USER: I am Samuel Taylor here, I want to reserve my ticket from LAS to IAD, can you please help me?

ASSISTANT: Sure, when are you planning to start and return on?

USER: Sure, my planned dates of journey are from Feb, 06 to Feb, 08.

ASSISTANT: Do you need a connecting flight?

USER: Yes, I need a connecting flight.

ASSISTANT: In which class do you want to fly?

USER: I am ok with any class preference.

ASSISTANT: At what time do you want to start and return on?

USER: Yes, I need a depart time at afternoon and return time at evening.

ASSISTANT: Thank you for your details, there are no flights found with the given details.

USER: Ok, that's fine. Anyways, thank you for your service.

ASSISTANT: Thank you.