You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: Linda Campbell here.

ASSISTANT: How can I help you?

USER: I would like to visit Las Vegas for a business meeting, can you please help me out with booking of a flight ticket to go there?

ASSISTANT: Yes, I can help you. Can you share me your travelling dates?

USER: Sure, I am planning to move on 07/12 and please book my return ticket on 07/14.

ASSISTANT: Ok, can I know your nearest airport codes?

USER: Sure, I want to travel from PHL to LAS.

ASSISTANT: Give me a moment.

USER: Sure.

ASSISTANT: Sorry to inform you that there are no flights found on your requested dates.

USER: Oh! So sad to hear that. Anyway, thank you for the information.

ASSISTANT: That's ok. Anyways, thank you for your help.

USER: Welcome.