You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: I am Mary Adams here. I want to reserve my ticket from DEN to LGA, can you please help me out?

ASSISTANT: Sure, I will help you. May I know your journey dates?

USER: Sure, my preferable dates of journey are from 02/02 to 02/04.

ASSISTANT:  Please provide me your depart time and arrival time.

USER: No, I am flexible with any timing.

ASSISTANT: In which class do you want to travel?

USER: I want to travel in a economy class.

ASSISTANT: Thanks for your details, there are no flights found on your data.

USER: Ok, not an issue. Anyways, thank you for your service.

ASSISTANT: Thank you.