You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Lisa Hill from Seattle.

ASSISTANT: How may I help you?

USER: I need to attend a cultural event in Las Vegas so please help me with flight ticket booking.

ASSISTANT: Could you please let me know your airport codes.

USER: Thank you, I have to travel from SEA to LAS.

ASSISTANT: Please provide your travelling dates.

USER: Sure, I need to travel on dates of 03/23 and 03/25.

ASSISTANT: Sorry, no flights found for your travelling dates.

USER: Oh! It is sad to hear. Anyway, thank you for your time.

ASSISTANT: Thanks. Have a nice day!.

USER: Most welcome.