You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I assist you?

USER: I am Linda Lewis.

ASSISTANT: Nice to meet you, Lewis.

USER: I am Planning to travel from LAS to DFW, can you help me in booking a ticket ?

ASSISTANT: Sure, can you please share your dates of journey for booking purpose?

USER: Sure. My takeoff dates are 05/07, and my return date is on 05/09.

ASSISTANT: Ok, wait for a while.

USER: Sure.

ASSISTANT: Sorry, there is no flight is available as per your details of travel.

USER: It's fine. Anyway, thank you for your help.

ASSISTANT: You are welcome.