You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you today?

USER: I want to travel from LAS to DFW for my hangout trip, can you please reserve a flight ticket?

ASSISTANT: Sure, we are here to help you.

USER: Thank you.

ASSISTANT: Can you share me your travelling dates?

USER: My date of boarding is on July 25 and please book my return ticket on July 27.

ASSISTANT: May I know your name?

USER: Sure, my name is Donald Williams.

ASSISTANT: Do you have any other specifications?

USER: I would like to depart at evening time.

ASSISTANT: Ok, wait for some time.

USER: Sure, take your time.

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

USER: Oh! Sad to hear that. Anyway, I will reach another booking agency. Thank you for checking.

ASSISTANT: Thanks for approaching us.